So these hackers came on and lagged my server like crazy. Then they somehow got to use the OP commands even though im the only OP on the server and I didn't OP them. Whenever I tried to ban them in-game or on the console it said "You are unable to ban this person". He had access to all the commands and even the normal nonhacking players got to use all the commands! Can someone tell me how this is possible and how to stop it??? Sorry for the double post but the hackers and everyone else had creative and I didn't give it to them. EDIT by Moderator: merged posts, please use the edit button instead of double posting.