I have a new theory…
Do you have Wildfire set to add new / all users to a default group, then you manualy add users to the other groups (Business Devolopment, administrative…ect?)
I looks like where the (27 online,) is there is a group that is not expanded, I’'ll bet that if you were to expanded that top group you would see all the users that are members of all the other groups.
Then go into Wildfire Groups and I’'ll bet that all users are members of a default group with no name AND their other respective group.
If I remember correctly I redid / renamed my user groups about 3 months ago, I’‘ll bet that’'s when I lost this also.
(Wow, I’'m doing a lot of betting here…I might have a problem…lol)
To test, open the Wildfire admin console, then go to the users/Groups then registration properties, and then check / change the default user group name.