Problem/Bug Multiverse, separating inventories and stats.

Hello,

I've been experiencing some problems on my server with multiverse, all chats and stats are linked for all worlds. Can someone tell me how to separate them? I've tried per world inv but I'm not sure how to config it or how it works for that matter. I need a detailed guide please.

Info:
Spigot 1.8.8
Multiverse2

At the moment I have 3 worlds: World, hub, parkour.
If you want to discuss this on skype send me a PM and I'll send you my Skype.

Thank you,
~NoHaxPunchTrees