Yea its not your client installation, its your server installation, thats why other people see it too, and why when you go to another server its not there. I had that problem for long time all i can suggest is updating with hldsupdatetool.exe and see if it fixes it for you, it just went away one day for me after i did some updates. I also switched to amx mod 0.9.8 from 0.9.7 that could be solution too. If you take bots off your server, does that problem still exist? (It probalby does cuz i dont think its bot related).