I think you want different values for those, like instead of making them both '1' make the second one '2'.
Oh woops! I did that, it's still not saving the value.
Edit:
Correction, it does work. The bitfields had just not been rebuilt. Now I just don't know how to call on each bitfield independently, any help there?
I'll try to help you figure it out, but I don't understand what you're doing. What exactly are you doing with the xml in the first post, and what do you mean by "making them save"?
Basically if you click yes to 'isserverstaff' then 'serverstuff' adds one to itself for that usergroup. But if you click 'isbetatester' then 'serverstuff' adds two to itself. Meaning that if I try and call on 'serverstuff' the current way I cannot have the 'isbetatester' field because I call on it with something like $permissions['serverstuff']. I want to be able to check if the person isserverstaff, not just serverstuff. Make more sense?