Sometimes the npc's i select to be spawned will never spawn or will be the only ones spawning. For example, one time on gm_bigcity i chose all of the half life 2 zombies, but when i activated it only ordinary zombies would spawn. Then without my input, it changed to poison zombies, and only they would spawn. Then it changed again to fast zombies. It seemed like an intentional loop, with the cycle repeating itself. Zombies to poison zombies to fast zombies. Is there some type of conflict going on? I really don't know what to make of this. This only happened once by the way, usually it works fine.