Are you an administrator for this site? If so, that's probably why you're getting these messages. I get about 2 or 3 a day.
I thought I would be able to log in as administrator and offer you the chance to stop you being an administrator in future. However, I don't now seem to be able to log in as an administrator.
It used to show whether people were members/ moderators/ admin next to their avatar, but it doesn't seem to now.
Perhaps somebody (the new site owner?) has changed the settings?