Using Firebug (the Firefox add-on) to examine the page, the offending area is actually an iframe found within the "RateCommentDiv" element on the page. This div is using absolute positioning with CSS, which is telling it to be in the upper-left corner of the window:
HTML Code:
<div style="position: absolute; left: 0px; top: 0px; visibility: visible; z-index: 2000;" name="RateCommentDiv" id="RateCommentDiv">
<iframe width="400" scrolling="yes" height="100" frameborder="0" src="empty.htm" noresize="" marginwidth="0" marginheight="0" vspace="0" hspace="0" id="RateCommentFrm" name="RateCommentFrm"></iframe>
</div>
Phil