Pictures in the menu are low resolution

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The pictures in the menu (server header image, profile picture, language picture) are all pixelated for me. I have the problem on every server image.
https://imgur.com/a/4RtJRv7
https://imgur.com/a/qOd0tMx
What can I do about that? I reinstalled the game already and deleted all the files, but it didn't work.

[Big Meeks]

goes off your graphics setting, 1 low res, 5 high res.