I would try using an html validator on you pages and see if that helps you fix the problem.
http://validator.w3.org/
When you use that, it will tell you where you are having problems - which line of your source code. So, before you do that, do this: vboptions > General Settings > Add Template Name in HTML Comments > set to Yes . This way the name of the templates will be in your source and you can find the template you need to edit.