How can someone be an admin and not be in the admin usergroup?

[Macsee]

Thanks, kh99. The registrations IPs and everything look exactly the same, as do all the other details like DOB, homepage etc., that the user filled in. Other indicators now point to this being a genuine user not up to any fishy business.

I regret I can't do the db query now as I've made some changes and deleted one of those accounts.

It may be pertinent to note that these two accounts were both created when the forum was running on phpBB and before it was imported into vB. That may have had some influence on the weird behaviour I noted in the OP.