My single GPU is getting better FPS in Guild Wars 2 than Crossfiring.
I have 2 5850. It seems like 1 card by itself gets better FPS then 2 graphics card at the same time, what is the issue here? Is it supposed to do that?
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Nope it's not supposed to do that. The issue is that AMD has crappy multi-GPU driver support . If you haven't already, I'd recommend updating your drivers and seeing if that helps.
Don't worry you don't have a hardware issue, its just that GW2 doesn't officially support multi-GPU Tech. I think AMD and Nvidia are trying to combat the situation at the moment. Just disable one of your cards when playng GW2 for now until a CAP comes from AMD supporting it.