UUID Problem -> Permissions, Inventory, the whole Playerdata

Hey guys,

atm I am setting up a server network with BungeeCord / Spigot servers.
BungeeCord is running online mode while the Spigot servers are running offline mode. I installed OnlyProxy so every single player has to join via the BungeeCord, onlinemode true server.
I set up permissions via Pex and a mysql database so on every sub-server there are the same permissions available.

Now my problem.
Once I restart BungeeCord (or whatever, i never really messed around with offline mode servers) the...

UUID Problem -> Permissions, Inventory, the whole Playerdata