someone to help me? I could not solve the problem.

Then the error is only in IE9, I tested in several PCs and all showed the bug in Internet Explorer 9 as shown in the pictures.

Take the test in IE9.

I forgot to say, if I clik in Compatibility View button in IE9 in the Address bar, the layout is displayed normally.

Anyone can help me to fix it?

Your Portal Version: 2.0.1
Your phpBB Type: Standard phpBB3
MODs installed: Yes
Your knowledge: Basic Knowledge
Boardlink: http://www.equipeggt.com.br/forum

What have you done before the problem was there?
Create many subforums.

What have you already tryed to solve the problem ...