Unattainable Item In Dropdown Menu Ie8

the page : http://medisra.sideradesign.com/ on the second menu from the left, there is a dropdown. I am not able to click on the last 3 items of the submenu because they disappear

Solution 1:

The most direct reason for this problem is that the page is being set to render in IE7 mode via the HTTP response headers:

HTTP/1.1 200 OK
..
X-UA-Compatible: IE=EmulateIE7
..

This header is effectively turning IE8 into IE7, which isn't great. The purpose of X-UA-Compatible is to provide a quick way to help older pages designed for IE7 still look acceptable in IE8.

If you remove this header, the page looks almost correct in IE8 (just a couple of minor display problems; they look relatively easy to fix).