Category query inconsistency

I have the following code in the sidebar of my site. It works fine on every page, except for the homepage. On the homepage, a sub-category of 3 is showing up under the “categories” <li> instead of the “notebook” <li>. Thanks for your help.

<li id="categories">
				<h3><?php _e( 'Categories', 'sandbox' ) ?></h3>
				<ul>
<?php wp_list_categories('title_li=&show_count=0&hierarchical=1&exclude=3') ?> 

				</ul>
			</li>

			<li id="notebook">
				<h3><?php _e( 'Leslie\'s Notebook', 'sandbox' ) ?></h3>
				<ul>
<?php wp_list_categories('title_li=&show_count=0&hierarchical=0&child_of=3') ?> 

				</ul>
			</li>