WordPress custom menu can't show 3. level submenu

I Use a custom walker from my menu in WordPress and my menu doesn't show all levels. https://soulofcroatia.com/ -One Day menu item.

This is my code in header.php

?php
                wp_nav_menu( array(
                    'theme_location'  = 'mainmenu',
                    'menu'            = 'mainmenu',
                    'container'       = 'ul',
                    'container_class' = 'collapse navbar-collapse',
                    'container_id'    = 'navbarCollapse',
                    'menu_class'      = 'nav-list',
                    'echo'            = true,
                    'fallback_cb'     = 'wp_page_menu',
            'items_wrap'      = 'ul class=%2$s%3$s/ul',
            'depth'           = 3,
            'walker'          = new Primary_navigation_walker(),
            ) );
            ?

this is my code in custom-walkers.php

class Primary_navigation_walker extends Walker_Nav_Menu {
    function start_lvl( $output, $depth = 0, $args = array() ) {
        $indent  = str_repeat( \t, $depth );
        $output .= \nul class='submenu-list width-xl'$indent\n;
    }

    function end_lvl( $output, $depth = 0, $args = array() ) {
        $indent  = str_repeat( \t, $depth );
        $output .= $indent/ul\n;
    }

    function start_lv2( $output, $depth = 1, $args = array() ) {
        $indent  = str_repeat( \t, $depth );
        $output .= \nul class='submenu-list width-xl sub2'$indent\n;
    }

    function end_lv2( $output, $depth = 1, $args = array() ) {
        $indent  = str_repeat( \t, $depth );
        $output .= $indent/ul\n;
    }

    function display_element( $element, $children_elements, $max_depth, $depth, $args, $output ) {
        $id_field = $this-db_fields['id'];
        if ( is_object( $args[0] ) ) {
            $args[0]-has_children = ! empty( $children_elements[ $element-$id_field ] );
        }
        parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
    }

    /**
     * Starts the element output.
     *
     * @param string   $output Used to append additional content (passed by reference).
     * @param WP_Post  $item Menu item data object.
     * @param int      $depth Depth of menu item. Used for padding.
     * @param stdClass $args An object of wp_nav_menu() arguments.
     * @param int      $id Current item ID.
     *
     * @see Walker::start_el()
     *
     * @since 3.0.0
     * @since 4.4.0 The {@see 'nav_menu_item_args'} filter was added.
     */
    public function start_el( $output, $item, $depth = 0, $args = null, $id = 0 ) {
        if ( isset( $args-item_spacing )  'discard' === $args-item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = \t;
            $n = \n;
        }
        $indent = ( $depth ) ? str_repeat( $t, $depth ) : '';

        if ( $depth == 0 ) {
            $classes = array( 'nav-item' );
        } elseif ( $args-has_children  $depth == 1 ) {
            $classes = array( 'submenu-item sub' );
        } else {
            $classes = array( 'submenu-item' );
        }

        /**
         * Filters the arguments for a single nav menu item.
         *
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param WP_Post $item Menu item data object.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 4.4.0
         */
        $args = apply_filters( 'nav_menu_item_args', $args, $item, $depth );

        /**
         * Filters the CSS classes applied to a menu item's list item element.
         *
         * @param string[] $classes Array of the CSS classes that are applied to the menu item's `li` element.
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 3.0.0
         * @since 4.1.0 The `$depth` parameter was added.
         */
        $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
        $class_names = $class_names ? ' class=' . esc_attr( $class_names ) . '' : '';

        /**
         * Filters the ID applied to a menu item's list item element.
         *
         * @param string $menu_id The ID that is applied to the menu item's `li` element.
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 3.0.1
         * @since 4.1.0 The `$depth` parameter was added.
         */
        $id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item-ID, $item, $args, $depth );
        $id = $id ? ' id=' . esc_attr( $id ) . '' : '';

        $output .= $indent . 'li' . $id . $class_names . '';

        $atts           = array();
        $atts['title']  = ! empty( $item-attr_title ) ? $item-attr_title : '';
        $atts['target'] = ! empty( $item-target ) ? $item-target : '';
        if ( '_blank' === $item-target  empty( $item-xfn ) ) {
            $atts['rel'] = 'noopener noreferrer';
        } else {
            $atts['rel'] = $item-xfn;
        }
        $atts['href']         = ! empty( $item-url ) ? $item-url : '';
        $atts['aria-current'] = $item-current ? 'page' : '';

        /**
         * Filters the HTML attributes applied to a menu item's anchor element.
         *
         * @param array $atts {
         *     The HTML attributes applied to the menu item's `a` element, empty strings are ignored.
         *
         * @type string $title Title attribute.
         * @type string $target Target attribute.
         * @type string $rel The rel attribute.
         * @type string $href The href attribute.
         * @type string $aria_current The aria-current attribute.
         * }
         *
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 3.6.0
         * @since 4.1.0 The `$depth` parameter was added.
         */
        $atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );

        $attributes = '';
        foreach ( $atts as $attr = $value ) {
            if ( is_scalar( $value )  '' !== $value  false !== $value ) {
                $value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
                $attributes .= ' ' . $attr . '=' . $value . '';
            }
        }

        /** This filter is documented in wp-includes/post-template.php */
        $title = apply_filters( 'the_title', $item-title, $item-ID );

        /**
         * Filters a menu item's title.
         *
         * @param string $title The menu item's title.
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 4.4.0
         */
        $title = apply_filters( 'nav_menu_item_title', $title, $item, $args, $depth );

        if ( $args-has_children  $depth == 0 ) {
            $aClasses = 'class=nav-link has-submenu js-nav-submenu';
        } elseif ( $args-has_children  $depth == 1 ) {
            $aClasses = 'class=nav-link has-submenu js-nav-submenu sub';
        } elseif ( $depth == 0 ) {
            $aClasses = 'class=nav-link';
        } else {
            $aClasses = 'class=submenu-link';
        }

        $item_output  = $args-before;
        $item_output .= 'a ' . $attributes . $aClasses . '';
        $item_output .= $args-link_before . $title . $args-link_after;
        $item_output .= '/a';
        $item_output .= $args-after;

        /**
         * Filters a menu item's starting output.
         *
         * The menu item's starting output only includes `$args-before`, the opening `a`,
         * the menu item's title, the closing `/a`, and `$args-after`. Currently, there is
         * no filter for modifying the opening and closing `li` for a menu item.
         *
         * @param string $item_output The menu item's starting HTML output.
         * @param WP_Post $item Menu item data object.
         * @param int $depth Depth of menu item. Used for padding.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         *
         * @since 3.0.0
         */
        $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
    }

    /**
     * Ends the element output, if needed.
     *
     * @param string   $output Used to append additional content (passed by reference).
     * @param WP_Post  $item Page data object. Not used.
     * @param int      $depth Depth of page. Not Used.
     * @param stdClass $args An object of wp_nav_menu() arguments.
     *
     * @since 3.0.0
     *
     * @see Walker::end_el()
     */
    public function end_el( $output, $item, $depth = 0, $args = null ) {
        if ( isset( $args-item_spacing )  'discard' === $args-item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = \t;
            $n = \n;
        }
        $output .= /li{$n};
    }
}

class Terms_link_walker extends Walker_Nav_Menu {

    public function start_el( $output, $item, $depth = 0, $args = null, $id = 0 ) {
        if ( isset( $args-item_spacing )  'discard' === $args-item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = \t;
            $n = \n;
        }
        $indent = ( $depth ) ? str_repeat( $t, $depth ) : '';

        $classes   = empty( $item-classes ) ? array() : (array) $item-classes;
        $classes[] = 'menu-item-' . $item-ID;

        /**
         * Filters the arguments for a single nav menu item.
         *
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param WP_Post $item Menu item data object.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 4.4.0
         */
        $args = apply_filters( 'nav_menu_item_args', $args, $item, $depth );

        /**
         * Filters the CSS classes applied to a menu item's list item element.
         *
         * @param string[] $classes Array of the CSS classes that are applied to the menu item's `li` element.
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 3.0.0
         * @since 4.1.0 The `$depth` parameter was added.
         */
        $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
        $class_names = $class_names ? ' class=' . esc_attr( $class_names ) . '' : '';

        $atts           = array();
        $atts['title']  = ! empty( $item-attr_title ) ? $item-attr_title : '';
        $atts['target'] = ! empty( $item-target ) ? $item-target : '';
        if ( '_blank' === $item-target  empty( $item-xfn ) ) {
            $atts['rel'] = 'noopener noreferrer';
        } else {
            $atts['rel'] = $item-xfn;
        }
        $atts['href']         = ! empty( $item-url ) ? $item-url : '';
        $atts['aria-current'] = $item-current ? 'page' : '';

        /**
         * Filters the HTML attributes applied to a menu item's anchor element.
         *
         * @param array $atts {
         *     The HTML attributes applied to the menu item's `a` element, empty strings are ignored.
         *
         * @type string $title Title attribute.
         * @type string $target Target attribute.
         * @type string $rel The rel attribute.
         * @type string $href The href attribute.
         * @type string $aria_current The aria-current attribute.
         * }
         *
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 3.6.0
         * @since 4.1.0 The `$depth` parameter was added.
         */
        $atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );

        $attributes = '';
        foreach ( $atts as $attr = $value ) {
            if ( is_scalar( $value )  '' !== $value  false !== $value ) {
                $value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
                $attributes .= ' ' . $attr . '=' . $value . '';
            }
        }

        /** This filter is documented in wp-includes/post-template.php */
        $title = apply_filters( 'the_title', $item-title, $item-ID );

        /**
         * Filters a menu item's title.
         *
         * @param string $title The menu item's title.
         * @param WP_Post $item The current menu item.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         * @param int $depth Depth of menu item. Used for padding.
         *
         * @since 4.4.0
         */
        $title = apply_filters( 'nav_menu_item_title', $title, $item, $args, $depth );

        $item_output  = $args-before;
        $item_output .= 'a' . $attributes . 'class=terms-link';
        $item_output .= $args-link_before . $title . $args-link_after;
        $item_output .= '/a';
        $item_output .= $args-after;

        /**
         * Filters a menu item's starting output.
         *
         * The menu item's starting output only includes `$args-before`, the opening `a`,
         * the menu item's title, the closing `/a`, and `$args-after`. Currently, there is
         * no filter for modifying the opening and closing `li` for a menu item.
         *
         * @param string $item_output The menu item's starting HTML output.
         * @param WP_Post $item Menu item data object.
         * @param int $depth Depth of menu item. Used for padding.
         * @param stdClass $args An object of wp_nav_menu() arguments.
         *
         * @since 3.0.0
         */
        $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
    }

    /**
     * Ends the element output, if needed.
     *
     * @param string   $output Used to append additional content (passed by reference).
     * @param WP_Post  $item Page data object. Not used.¬
     * @param int      $depth Depth of page. Not Used.
     * @param stdClass $args An object of wp_nav_menu() arguments.
     *
     * @since 3.0.0
     *
     * @see Walker::end_el()
     */
    public function end_el( $output, $item, $depth = 0, $args = null ) {
        if ( isset( $args-item_spacing )  'discard' === $args-item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = \t;
            $n = \n;
        }

        $output .= {$n} / ;
    }
}