Sidebar page listing problem

My sidebar works fine on the home page but often doesnt display pages and categories on other pages or sub-pages. I want the same information to display in the sidebar on all of my pages. Any ideas? http://www.endpeg.com

The code in sidebar.php is:

<h4><?php _e('Browse by Subject:'); ?></h4>
<ul>
<?php wp_list_cats('sort_column=name'); ?>
</ul>

<h4><?php _e('Browse by Month:'); ?></h4>
<ul>
<?php wp_get_archives('type=monthly'); ?>
</ul>

<h4><?php _e('Other Pages:'); ?></h4>
<ul>
<?php wp_list_pages('title_li='); ?>
</ul>