Crossfire lagging :/

Hey guy's i bought a new graphic card online when it came to my house i installed it in my computer before i used to play 8v8 room's on low settings getting 20-30 fps, when i installed it now i get 80-90 fps on low but that's not the problem. Anyways when i installed it, i started type lagging and my mouse some time's move's to far were i want it to be.

Graphic card: PNY nVidia GeForce GTS 250

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