wp_dropdown_categories generating url ID number instead of slug

[laZuRe]

Hi all, this problem has me going nuts now.

in http://staging.tahititravel.com.au/package/

if you choose a category in the category filter box, the parent categories generate an ID number instead of the category slug in the URL. It's not SEO im worried about, it's that the WP_Query doesn't work if it doesnt generate a proper URL. So the box for sorting next to the category will not work.

The categories within the hierarchy works fine.

 

<form action="<?php bloginfo('url'); ?>/" method="get">
				<?php
                    $select = wp_dropdown_categories('show_option_all=Filter by Category...&exclude=1,31,21&show_count=1&hide_empty=1&depth=3&hierarchical=false&orderby=name&echo=0&selected=6&taxonomy=category');
                    $select = preg_replace("#<select([^>]*)>#", "<select$1 onchange='return this.form.submit()'>", $select);
                    echo $select;
                    ?>
                    <noscript><input type="submit" value="View" /></noscript>
                    </form>

thanks

[laZuRe]

bump