Go to the link you provided (I use Firefox with FireBug), right-click and select view source. You'll find this orphan
HTML Code:
<!--bof Reviews button and count-->
<div id="productReviewLink" class="buttonRow back"><a href="http://www.pewterworld.co.uk/Shaving/ShavingBrushes/MirrorFinishPewterShavingBrush1/Reviews?zenid=#############">
<img src="includes/templates/robbo_red/buttons/english/button_reviews.gif" alt="Go to the Reviews Page" title=" Go to the Reviews Page " width="110" height="32" /></a></div>
<br class="clearBoth" />
<p class="reviewCount"></p>
<!--eof Reviews button and count -->
<!--bof Product date added/available-->
<!--eof Product date added/available -->
<!--bof Product URL -->
<!--eof Product URL -->
<!--bof also purchased products module-->
<!--eof also purchased products module-->
<!--bof Form close-->
</form>
There are three <form> calls on the page and three </form> so.... In theory, they should match BUT, something has gotten the closing tag on line 645 to THINK it has nothing to close.
The page has three other errors (all brought to you by Google+) and 185 warnings. Many of the warnings are in the cookie-law code. A lot are for the use of & versus & and many are for using <br> versus <br/>. Span calls are a small problem as well.
But, the main thing is the </form> on 645I If Firefox is confused, you can imagine what IE would do with it.
Upon further review... This is a commercial template isn't it? I find I have looked at it on another post with similar problems (bad code). Unfortunately, that instance was different. Still, I (and others here) do not recommend any commercial template. TMP too many problems.