Sponge Forge 1.12.2 | Some player spawning with GM 0 and GM1

Hey there,

I have got a problem with my sponge server, when new player join, some of them are in creative mode…I think
in the settings I made everywhere gamemode 0, the world gamemode is survival too.
I dont know what happening there that some of them randomly spawn with creative mode.

Do you have an idea?
I already try to make a commandblock with /gamemode “Player” 0, but this command doesnt works.

Plugins:
Nucleus
UniverseGuard2
LockPerms

Mods:

Thanks
My english is not so good, greetings from germany…^^