Green mark over players head Garrysmod

[Beaverbeliever]

Dread, if you want help, you should stop biting the hand feeding you. This is a support forum, not a bunch of paid specialists.

Anyways, about your problem, would you mind posting a Screenshot from ingame showing us the issue? Is it possible you have a LUA virus? I know that LUA viruses can be easily spread, and given just by connecting to a server with the LUA virus. What leads me to say this is when I Google searched your problem, I got quite a few results on LUA viruses and LUA aimbots.

Hope you find the issue