Showing Categories, Sub categories and descriptions

I am having a little issue of repeating sub-categories for some reason. I am using this code from this old thread, but on the categories page on my site, if you scroll towards the bottom, the sub-categories are repeated, as top level categories, even though they are not. I am wanting the categories to show as they are, with the sub-categories listed underneath their parent category description, I just cannot figure out why they are repeating at the bottom.

Here’s my entire template, in case someone can see something I have missed.

<?php
/* Template Name: Categories2 */
get_header(); ?>

<?php the_post(); ?>

<div id="entry">

<div class="entry-content">

<?php
process_cat_trees(); 

function process_cat_trees( $cat='' ) {
/*****************************************************************
*
* alchymyth 2011
* transformationpowertools.com/wordpress
* a hierarchical list of all categories, with descriptions
*
******************************************************************/

   if($cat == '') :
//add any parameter for get_categories() into the code in the next line//
     foreach( get_categories('hide_empty=true') as $category ) :
     if( !$cat->parent ) { $next[] = $category; }
	 endforeach; 

   else:
     $next = get_categories('hide_empty=true&parent=' . $cat);
   endif;

 if( $next ) :
 foreach( $next as $cat ) :

 if(get_category($cat)->category_description) {
   $desc = get_category($cat)->category_description; }
  else { $desc = ''; } 

 echo '<ul><li><a href="' . get_category_link($cat->term_id) . '" title="' . sprintf( __( "View all %s videos" ), $category->name ) . '" ' . '><strong>' . $cat->name . '</strong></a><span><br />' . $desc . '</span></li>'; echo "\n";
 process_cat_trees( $cat->term_id );
 endforeach;
 endif;

 echo '</ul>'; echo "\n";
}
?>

<?php get_search_form(); ?>

</div><!-- END ENTRY CONTENT -->
</div><!-- END ENTRY -->
</div><!-- END CONTENT -->

<?php get_footer(); ?>