When i do /world (worldname) it dosen't change worlds instead it says [bpermissions]Set selected world to worldname instead of teleporting me i use bpermissions essentials when i remove bpermissions this doesn't happen.
/world is a command in bPermissions. Most plugins will overwrite this and then force bPermissions to use /w, but Essentials apparently does not. A simple fix is to switch to another permissions manager, such as PermissionsEx. While I recommend bPerms all day, it seems like it's doing more harm than good in this situation.
Nah may aswell stick with it i don't use /world that often so it won't mind me. Offtopic:also where did you buy your server from?