Player Configs not saving on re-log...

So I've got my plugin Zephyrus and a few people have notified me that player configs do not save/get overridden when players re-log. The source is here. Here is the player listener that controls logging in and out (heres the LevelManager class) and here is the player config handler. In my testing, I have not been able to find this bug. I keep my levels, spells, etc. when I re-log and when the server restarts, etc.

Any help would be appreciated.
- minnymin3