Well done Rainbow. On a sidenote... It sounds/seems like the machine running your servers is under some stress when it changes levels/when players join... Might want to take a server or two down, try adjusting some of the rate settings, delete some of the old logs (normal logs and the sourceban logs). Delete the files from the downloads folder. That's the best I can recommend from here as I'm not entirely sure as to what's causing the issues.
Pyro, he may also be looking off gametracker, while gametracker is rarely correct! I doubt that was the case, more then likely he was using the legacy browser.
Could you please set the variable "zm_banshee_limit" to 1 on the ZM server? It will limit the amount of spawnable banshees to 1 per player; there's been to many banshee spammers these days