Beth,
I can't say this is a bug - I can certainly say that it is not
behavior that I want to happen.
As Andy said, it is by design.
The intent is that when you want a person to be a member of the subgroup you (and the invitee) don't have to go through the Invite process twice: first for the primary group and then all over again for the Subgroup.
With Direct add you do it somewhat the other way around: you Direct Add the person to the primary group, with the intended subgroup(s) checkmarked.
It is possible that a sensible #suggestion for beta would be to have Invite work like Direct Add. I haven't really thought about it that way, so I'm not sure if it would introduce any issues or more confusion.
I'm not sure how to lock down the main group so that subgroups can't
add members. Am I missing a setting?
Anything you want to lock down about a subgroup, you generally do though the subgroup's Settings page, not the primary's. The only exception I can think of offhand is the ability to create subgroups.
Shal
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