When you search for a title in the search box and click on one of the titles of the dropdown, it closes the dropdown. It is in Chrome 17-18. And In IE9, if I click in the search box, it loses his focus after a second.
I can't see this, well, it closes he dropdown, but also sends you to the game page of said game. Then again it closes the dropdown even if I middle-click to open in a new tab (regardless of browser; Firefox, Chrome, Opera, Epiphany... don't know about IE or Safari as I'm not on Windows), so I'd guess that's by design.
Sometimes, it sends me to the page, but most of the time, it does nothing (just closing the dropdown). I can reproduce this on Firefox 11, Chrome 18 and Internet Explorer 9.
Edit: Also, if you write something in the search input, do nothing and reload the page, the input is correctly filled, but when you click on the field, it's messed up and you can't put your cursor at the end of the word with the mouse.