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Beth,

I can't say this is a bug - I can certainly say that it is not behavior that I want to happen.?

?
- If by that you mean the mod being able to (indirectly) add a member, the solution is to limit their member-editing privileges as was stated.

- If by that you mean a subgroup member getting added to the main group as well when one would like them to only be in the subgroup, that's not a bug or even unwanted behaviour, it is because the subgroup is just that, a subgroup of the main group, and you cannot have members belonging to a subgroup and not to the main group***. (although you can the other way around)

***if you want that, you need a separate group, not a subgroup.

Cheers,
Christos