Dropping options of exposed filters breaks when user is logged I have a weird problem with Views exposed filters. 

When I click on some exposed filters the dropping options are appearing, but when I hover with the mouse, dropping options are immediately dissapearing without letting me choose any of them. This problem only occurs when user is logged, no matter what role is using. 
I've disabled the administration module, but the problem still remains.

Using exposed filter as a block doesn't have this problem and anonymous users too.

The same problem I've experienced in my other website too.
As Bala said, it is a CSS issue. I finally fixed it.
The problem comes from my &lt;#section id="main"&gt;. It's a wrapper to all the main content area in my theme.
It has display:inline, but when I change it into display:inline-block or by deleting the display, the dropping options are working flawlessly.