So i have this problem where it says [world] and then the prefix... anyone that can help??

Does it also display the [world] when you do /lp user <user> info?

If it does: Then just change the prefix.

If it doesn't: Then it's an issue with another plugin, I suspect MultiverseCore.

Maybe it is the prefixchat setting? https://github.com/Multiverse/Multiverse-Core/wiki/config.yml#multiverse-2-core-sample-config