GroupManager Users resets upon restart

Hello, whenever I restart my groupmanager users.yml file resets and everyone is made default rank, I'm not sure why. Here is my inheritance:

pn:
world:
- users
- groups
PN:
- users
- groups
spawn_nether:
- users
- groups
spawn_the_end:
- users
- groups
spawn:
- users
- groups
pn_nether:
- users
- groups
pn_the_end:
- users
- groups
groups:
- users
- groups

When I set a user's rank I use /manuadd <user> <rank> and it displays <user> was moved to group <rank> in pn. Do I need to specify a world or something...? This is getting very annoying as my server is in beta and requires constant changes.

Please Help

~Mir~