Weird Positions

I was playing on a Squid Game server when this thing poped up and it said something about how there's been problems with the game. Then it said would i like to fix it, so I put yes, then the next day everyone wasn't walking but they were sliding across the floor, so when people were going to atack me or pvp me i couldnt see when they were going to because i can't see what they were holding. I never had this happen to me befor, i refreshed i shut my pc down i checked to see if there was a bug on my pc but there was only one in the game, everyone is seeing right BUT ME. Please fix it, its driving me crazy. Thank you