in game shaders glich

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What I expected to happen was.it to be full screen..:
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What actually happened was.it turned on ingame shaders and wont turn off..:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. .i pushed full screen mode so it would come up full screen when i logged on..
3.then ingame shaders turned on permanently and has been like it ever since and i want it fixed ...