We were working with trying to customize the style/theme of the site and some how, the top post in the forum overlaps over the thread options at the top. I'm not exactly sure how to fix this or what might have caused it.
K, it has nothing to do with an unclosed tag, but with the CSS file you use. I suggest copying all the style info from the "style.php" file that you're linking into your new one and try to work out any discrepancies there.
When I commented out the css file you are using, the problem stopped happening. You could try using an absolute position for the content maybe, but honestly I'm not exactly sure what's causing this particular problem.