What's happened with the colors? Can you show me a screenshot?
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well to put things simply the colors are not what they are supposed to be, they're somewhat inverted, somewhat random, I've had the same problem with another game made in Unreal Engine but I was able to fix it by pressing Alt+Enter, but that game let me play windowed or full screen while this game forces me to play fullscreen which prevents the fix I was able to use for that game, as for the screenshot the colors look normal in it despite being broken in-game
F11 should put it into windowed mode, if not I'll have to go and put that in myself as well. Though weirdly enough left alt+enter seems to also be a command recognized by windows as a windows mode command.
In either case, something may be wrong with your GPU or its drivers. I have no possible way of knowing how to diagnose what could be causing this on my end.
Upon further research, I've found that this seems to sometimes happen to Fortnite supposedly sometimes due to updates to the game. It appears to be an issue to do with a combination of hardware/drivers and software. I'll have to look further into the issue, but I still recommend trying to figure out if your GPU or its drivers might have a fault of sorts that prevents them from running Unreal reliably. I would recommend searching up posts from people talking about such issues with Fortnite and seeing how well the fixes they share work for you here.