Multiple Dropdown's with Submit Button

I am pulling 2 categories into 2 dropdown lists. When I click submit the URL is showing the filtering but its just loading the homepage. I want the user to be able to select multiple categories and submit to show results.

    ?php $price = array(
    'show_option_all'    = '',
    'show_option_none'   = 'Price Range:',
    'orderby'            = 'ID', 
    'order'              = 'ASC',
    'show_count'         = 1,
    'hide_empty'         = 1, 
    'child_of'           = 110,
    'exclude'            = '',
    'echo'               = 1,
    'selected'           = 0,
    'hierarchical'       = 1, 
    'name'               = 'price',
    'id'                 = '',
    'class'              = 'styled-select',
    'depth'              = 0,
    'tab_index'          = 0,
    'taxonomy'           = 'category',
    'hide_if_empty'      = false
    ); ?

    ?php $region = array(
    'show_option_all'    = '',
    'show_option_none'   = 'Region:',
    'orderby'            = 'ID', 
    'order'              = 'ASC',
    'show_count'         = 1,
    'hide_empty'         = 1, 
    'child_of'           = 32,
    'exclude'            = '',
    'echo'               = 1,
    'selected'           = 0,
    'hierarchical'       = 1, 
    'name'               = 'region',
    'id'                 = '',
    'class'              = 'styled-select',
    'depth'              = 0,
    'tab_index'          = 0,
    'taxonomy'           = 'category',
    'hide_if_empty'      = false
    ); ?

    div class="search"

    form method="get" action="?php bloginfo('siteurl'); ?" id="category" 

    div class="four columns"
    div class="search_drop"?php wp_dropdown_categories( $price); ? /div
    /div

    div class="four columns"
    div class="search_drop"?php wp_dropdown_categories( $region); ? /div
    /div

    div class="four columns"
    input type="submit" name="submit" value="Filter" class="button" //form
    /div

    /div