wp_create_nonce doesn't verify when using WP_List_Table

I've created an admin page where I'm displaying a list of a MySQL Table using WP_List_Table. In this table I need to be able to delete a record when I want to. And that's where I have a problem.

To delete a record I've set up the following code.

class Genres_List extends WP_List_Table {

    [...]

    public static function delete_genre( $id ) {
        global $wpdb;
        $wpdb-delete(
            "{$wpdb-prefix}genres",
            [ 'id' = $id ],
            [ '%d' ]
            );
    }

    function column_cb( $item ) {
        return sprintf('input type="checkbox" name="id[]" value="%s" /', $item['id']);
    }

    function column_name( $item ) {
        $delete_nonce = wp_create_nonce( 'sp_delete_genre' );
        $title = 'strong' . stripslashes($item['name']) . '/strong';
        $actions = [
            'edit' = sprintf( 'a href="?page=%saction=%sid=%s"Bewerken/a', esc_attr( $_REQUEST['page'] ), 'edit', absint( $item['id'] ) ),
            'delete' = sprintf( 'a href="?page=%saction=deleteid=%s_wpnonce=%s"Verwijderen/a', esc_attr( $_REQUEST['page'] ), absint( $item['id'] ), $delete_nonce )
            ];
        return 'a href="?page=genresaction=editid=' . $item['id'] . '"strong' . stripslashes($item['name']) . '/strong' . $this-row_actions( $actions );
    }

    function get_columns() {
        $columns = [
            'cb' = 'input type="checkbox" /',
            'name' = 'Naam'
            ];

        return $columns;
    }

    public function get_bulk_actions() {
        $actions = [
            'delete' = 'Verwijderen'
            ];

        return $actions;
    }

    public function process_bulk_action() {
        if ( $this-current_action() === 'delete' ) {
            if ( ! wp_verify_nonce( $_REQUEST['_wpnonce'], 'sp_delete_genre' ) ) {
                die('This is a secure website. Your nonce did not verify. Go get a coffee.');
            } else {
                self::delete_genre( absint( $_GET['id'] ) );
                wp_redirect( esc_url( add_query_arg() ) );
                exit;
            }

            if ( $_POST['action'] === 'delete' || $_POST['action2'] === 'delete') {
                $delete_ids = esc_sql( $_POST['id'] );

                foreach ( $delete_ids as $id ) { self::delete_genre( $id ); }

                wp_redirect( esc_url( add_query_arg() ) );
                exit;
            }
        }
    }
}

The problem is that wp_verify_nonce( $_REQUEST['_wpnonce'], 'sp_delete_genre' ) returns false when trying to delete a record. I can't seem to find what I'm doing wrong, since I'm exactly following the Wordpress Codex:

1. Creating a nonce using wp_create_nonce( 'sp_delete_genre' ).
2. Using the nonce in a _wpnonce= parameter.
3. Verifying the nonce using wp_verify_nonce( $_REQUEST['_wpnonce'], 'sp_delete_genre' )