Problem removing a user
 

I have an old user that used to be a Moderator on my site that I want to delete as he has not visited for over two years.

He is now in the Registered Users group but when he appears in the list of user I want to prune he is showing as "Registered, Moderator".

He is not a Moderator of any section and if I move him into the Moderators group he shows up as "Moderators, Moderator".

I have checked the config file and there is no reference to him in there either.

Where else could this "Moderator" reference be coming from?