So this morning everything was fine, no world prefixes. Then, I added a few plugins at once; deathchests, plugman and protocollib. When I came on I see the world prefixes. I think, thats odd, ,how did that happen? So I checked the multiverse config and for some reason the prefixes are enabled. I then disabled it and reloaded multiverse. The prefixes were still there. I restarted the server and they were still there. I deleted ProtocolLib and Plugman, still there. Haven't deleted Deathchest but I dont see how that could be causing it.