BuddyPress.org

I’m near to make the new communitie’s site start and i’m regstering all my wp imported users to the public ‘triari’ buddypress group.
Using the admin function ‘GROUP’ in the admin dashboard i’m adding users.
– First is assigned as administrator
– Second as the moderator
and then all the others as members.
When i save the 19th member (it means ‘id in the group’ = 21) the administrator member disappear from the list and the system tells me I cannot drop all the admins !!! I can’t go any further but the front-end group dashboard presents me the correct situation: The administrator is still there and with the correct credentials.
Coming back to the back-end group, promoting one of the visible member as admin and then inserting the 20th member (id=22) the Moderator (id=2) disappears too!
I think this is could be a Group-Dashboard bug. Where can I write for this?

Thanks