I would like to play games with friends, or just games by myself. But, whenever I join a game, a weird bug occurs. It seems like the stuff i look at is getting duplicated again and again on my screen. I tried to uninstall and reinstall Minecraft, but nothing happened. I even restarted my computer and changed accounts and nothing happened still.
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Thank you @KillerbeeNL! It worked!
Have you tried to lower the anti aliasing setting (Settings -> Video -> Anti-Aliasing), does it cause any difference?