Ok, I'm ArrowJohn on the World of Minecraft SMP Survival Server. The problem is that I think some moderator or admin is messing with me and won't leave me alone. It built a jail in my house and it put up a sign that said "ENTER" but I didn't. I couldn't see the person because he/she was invisible and was in creative mode. When I said that someone was building in my house, the person broke the jail down and went out my door by opening it and i closed it. It then opened it again and I closed it. In my lowest room of my house behind the nether portal, there was a sign saying "?". Then I told everyone in the chat what was happening and then I went to clan base and it put up a sign next to me saying "REALLY?" then the person closed the iron doors of my clan base without switching the lever. My guess is that it was MrSnowGlobe messing with me because I asked deadlypixel69 why it was happening and she didn't know. So tell me why it was happening and make it stop.