I'm trying to fix this bug in IE8 for this page

It seem like it is a render problem but I can not find the real reason of this bug

The problem is text is not display in some part of the middle section.
However, it will display after you move a mouse over it or select it.

I found the similar bug in sitepoint and they suggest to add

Unfortunately it doesn't help me fix this bug.

Is there anyone have this kind of problem before and how to fix it?