we know about the server and banning people , we are working on it and will be fix as soon as we can
When TF2 updated a yesterday, a convar was added, cl_particles_show_bbox. Our anti cheats system did not detect that command as legit and perma banned the player. That part has been disabled until a fix is out. The convar is automaticly run by the player or their game. There were about a dozen poeple wrongfully banned and all have been unbanned. If you are or know someone that is still banned, leave a comment below.
Note that being flagged for cheating because of this has NOTHING to do with Valve Anti Cheat (VAC). So don't worry about being banned. Sorry for the confusion.
--- Update ---
The server has since had a TF2 update and everything should be working fine now.