First a admin is a admin.
It is either all or nothing not by forum.
Second which method were you using to add the user as a admin?
It can be a two step process for secondary admins.
First by user to set as admin then by forum for permissions.
Now since I do recall a past bug where all permissions would reset to 0.
I don't recall what version it was,since I never had the issue.
But anyway what version are you using?
