This isn't a ULib problem, nor a Team Ulysses release issue.
As you describe, ULib is loading perfectly when players join.
This is a Fadmin problem (it's overwriting your settings in UCL)
If you were skilled enough to figure out what you describe for MySQL and user conversion, perhaps figure out a way to prevent Fadmin from overwriting groups yet still allowing commands.
We've notified many people in the past asking this SAME issue regarding two admin mods and groups getting overwritten the same answer many times.
Disable Fadmin.
This may seem callous - perhaps in some ways it is.
We've tried to co-exist - even went so far as to use FPTje's 'universal admin library' which in theory was a good idea.
Then even it started conflicting with standards we tried following.