CSS bug in search box under Chrome

When I click on the search box at the top of the forum, buttons from a hidden menu bar appear on top of the menu bar. I have to click in just the right spot to be able to type in it.

The issue only occurs in Chrome, occurs on different computers, and is always repeatable. It does not appear to happen in Firefox or IE. 

Image 1: Before clicking on search bar

Image 2: After clicking on search bar

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