I think... Maybe, the GPU is drawing faster than your display can refresh. Is it tearing like this?
If so, it could be V-Sync settings on your graphics card.
V-Sync locks the display output (from your GPU) to the current refresh rate of your monitor (typically ~60Hz with a computer monitor, though it can vary with HDTVs). This prevents tearing, which is when the GPU sends a new frame "misaligned" with when your display is able to draw it (generally because the GPU is running faster-than the display can refresh).
Many times, for running benchmarks for no reason other than to generate high scores, you might disable V-Sync (because otherwise, your FPS average will be limited to your current display refresh rate). And, some absurdly dedicated FPS gamers swear by disabling it because, even though it looks like crap, the updated information in the "tears" might give them a few milliseconds "twitch advantage" in competitive games.
For everyone else, you should have V-Sync turned on in your GPU drivers.
I'd check there.