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i'm not sure if this was a glitch or a harmful addon but a loooooooong time ago on my server, whenever anyone joined, it would tell them they got auto admin, even though they didn't
it was extremely annoying to have to say every single time "no it's a glitch you didn't really get admin please shut up", and also one time someone got angry and thought it was a prank and left before i could explain
basically it was an extremely annoying issue, glitch or not
also i know this was a fairly common thing but i had the flashing map issue on some maps
a few maps would blink from a random color to white really fast when i played them