check page.php for an excess closing div </div> in the following area:
<div id="content">
<div id="post-301" class="post clearfix">
<h3 class="title">Test Page</h3>
</div><!-- this could be the wrong one -->
<div class="entry">
<p>This is a test page to test formatting of the sidebar…</p>
</div><!-- end of div .entry -->
</div><!-- end of div .post -->
<div class="navigation clearfix">
<div class="alignleft"></div>
<div class="alignright"></div>
</div><!-- end of div .navigation -->
</div><!-- /content -->
hope you can make sense of the above, good luck 😉