Hmm, I'm not experiencing that issue here. What browser are you working in? Also, it's a good first step at this stage to go ahead and validate all of your HTML (http://validator.w3.org/check?uri=ht...ss=1&verbose=1
You currently have 25 listed errors and 4 warnings. These might be contributing to your problem. Once you're using valid code post back so we can take a look at a clean page.
P.S. Welcome to the forums!