Blurry Ingame

Dear all, A few days ago I bought a LG 34uc89g. Im playing with 2560x1080 resolution. For some reason, the game looks a bit blurry. The client is completely sharp but ingame looks just strange. I really hate how it looks and would like to fix it. Already installed the newest gpu driver and checked the resolutions. It's also blurry when Im playing in window mode with 1920x1080. [Picture 1]( [Picture 2]( Please take a look at this pictures so you know what I mean. Can someone help me?
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