How to list custom taxonomy in columns

Hello,
I am trying to generate a list of custom taxonomies that displays both parent and child terms. Here is the code I have so far, it displays a list of parent terms in 3 columns the way I want it to but when I change the depth to 0 to display child terms it breaks the layout and gives me a single column list rather than 3 columns. Any hints as to what I am doing wrong would be greatly appreciated.

<?php
  /*
  Template Name: Listing Page
  */

  get_header(); ?>

  <div id="main"><!-- start #content -->

	<div id="post-area"><!-- start #blog-single -->

		<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

        <div class="breadcrumb">
			<?php if (function_exists('dimox_breadcrumbs')) dimox_breadcrumbs(); ?>
		</div><!--breadcrumb-->

     <h1><?php the_title(); ?></h1>

        <div class="add-listing">
           <?php echo do_shortcode( '[dr_add_listing_btn text="Add Listing" view="always"]' ) ?>
           </div><!--add-listing-->
         <div class="listing-search">
            <?php echo do_shortcode( '[ULWPQSF id=2461]' ) ?>
            </div><!--listing-search-->

		 <div id="content-area">
			<?php the_content(); ?>
          </div><!--content-area-->

 			<?php
				$catArray = explode("</li>",wp_list_categories('taxonomy=listing_state&hide_empty=0&title_li=&echo=0&depth=1&hierarchical=1&show_option_none=Nocategories'));
				$catCount = count($catArray) - 1;
				$catColumns = round($catCount / 3);
				$twoColumns = round($catColumns + $catColumns);
				for ($i=0;$i<$catCount;$i++) {
				if ($i<$catColumns){
				$catLeft = $catLeft.''.$catArray[$i].'</li>';
        	 }
				elseif ($i<$twoColumns) {
				$catMiddle = $catMiddle.''.$catArray[$i].'</li>';
			}
				elseif ($i>=$catColumns){
				$catRight = $catRight.''.$catArray[$i].'</li>';
			}
			};
			?>
				<ul class="left">
      		<?php echo $catLeft; ?>
				</ul>
				<ul class="middle">
			<?php echo $catMiddle; ?>
				</ul>
				<ul class="right">
      		<?php echo $catRight; ?>
			</ul>

		<?php endwhile; endif; ?>

			<?php wp_link_pages(); ?>
         </div><!-- post-area -->
      </div><!--main -->

   <?php get_sidebar(); ?>
   <?php get_footer(); ?>