I can pvp on my server I can kill animals on my server but I can't kill bots or scientists can anyone tell me whats going on ?

Do you have Vanish or Godmode mods?

I was in vanish left it running all night and in the morning I loaded botspawn came out of vanish and tried to kill them and couldn't so I restarted the server and everything was fine must have just been bugged thanks for the reply.