Red Square problems!

About a week ago I ran across a strange problem involving the common red square error.
The problem with this one is that I get the square when someone else is on the server and when I’m on the server alone everyone else seems to get it.
I tried everything I can think of, turned of both anti virus and my firewall. We tried restarting the server and I reinstalled GTA and FiveReborn. The serveradmin told me nothing out of the ordinary comes up on the serverlog and I seem to be connected just fine.
I also ruled out my router as the source and checked my PC for any malware.

I’ve got a legit, up-to-date Steam version of GTA and its running on windows 10.

I personally can’t think of anything else to do but maybe you guys can help me out.

Sincerely,
John

Please use this format to post your error.
Did you read the F.A.Q?