Weird Selecting (ubuntu)

I have a problem that when I try to select something, something like this happens.


Two of the edges are selected but the other one isn’t. Just like if I had doubles there.

But I have removed doubles. I haven’t been changing any blender settings but I did update my OS the other day (To Ubuntu 14.04). I have a AMD graphics card. Can anyone please help me? I have no clue what’s happening!!!