So my IGN is FoundOdyssey, but the permission manager retains my name as foundodyssey.
So it's not counting me it as me?? The commands using my name like /lp user FoundOdyssey parent add Owner. Works but I never get the prefix or the commands because it really adds foundodyssey.

Is the group and/or the prefix showing in /lp user FoundOdyssey info?

The case of the letters shouldn't matter, because it is still the same UUID

Yes it is showing up under there.