Comment Heading Keeps Showing Up

This is my index.php template… my site uses it for things like tags (site/tags/). Problem is, <h1>Comments</h1> shows up on everything except when it is the main page.

<?php get_header(); ?>
<div id="content">
<?php include(TEMPLATEPATH."/l_sidebar.php");?>
<div id="contentmiddle">
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class="contentdate">
<h3><?php the_time('M'); ?></h3>
<h4><?php the_time('j'); ?></h4>
</div>
<div class="contenttitle">
<h1><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h1>
<p><?php the_time('F j, Y'); ?> | <?php comments_popup_link('Leave a Comment', '1 Comment', '% Comments'); ?></p>
</div>
<?php the_content(__('Continue reading&hellip;'));?>
<div class="postspace">
</div>
<!--
<?php trackback_rdf(); ?>
-->
<?php endwhile; else: ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p><?php endif; ?><br />
<h1>Comments</h1>
<?php comments_template(); // Get wp-comments.php template ?>
</div>
<?php include(TEMPLATEPATH."/r_sidebar.php");?>
</div>
<?php get_footer(); ?>