PWI (Per world Invintory) deleted my items.

I used PWI to seperate inventories for a game world and a survival world, i played one of the games once, went to the survival world, my items were gone, i disconnected, made sure i was in survival, and changed all of the pwi data files and the server data files, also checked the log files.Please help i dont want it to happen again or to other members of my server.Thanks for the help.

Im using Multi verse also to have different worlds.