orderby => 'title' not working.

Hi, I’m having a problem ordering some posts in a navigation list. here is my code:

<ul class="tree lvl-0">
			<?php
				$args = array('child_of' => 6);
				$categories = get_categories( $args );
				foreach($categories as $category) {
					echo '<li class="collapsed"><a href="' . get_category_link( $category->term_id ) . '"' . $category->name  . '" ' . '>' . $category->name.'</a>';
					$cat_id= $category->term_id;
					wp_reset_query();
					$args = array(
						'cat' => $cat_id,
						'posts_per_page' => 20,
						'order' => 'ASC',
						'orderby' => 'title'
					);
					query_posts($args);
                    			// start the wordpress loop!
                   			?>
                    			<ul class="lvl-1">
                    				<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
 							<li><a href="<?php the_permalink();?>"><?php the_title(); ?></a></li>
                       				<?php endwhile; endif; ?>
                    			</ul>
                  			</li>
				<?php wp_reset_query(); } ?>
		</ul>

Im not too sure what order they are in, It might be date.
Also, when I order by ‘name’ or anything else, it works. ??

Thanks for any help in advance

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