I just noticed that (suddenly) an SE employee (Kasra Rahjerdi) shows up as a per site moderator on Math Educators see https://matheducators.stackexchange.com/users?tab=moderators
While I would not be opposed if he was actually appointed as a mod on the site, it seems more like a bug to me (no appointment date, and no activity on the site).
What's more this also seems to happen on various other sites (not only beta sites), e.g.:
- https://pets.stackexchange.com/users?tab=moderators
- https://worldbuilding.stackexchange.com/users?tab=moderators
- https://graphicdesign.stackexchange.com/users?tab=moderators
- https://scifi.stackexchange.com/users?tab=moderators
- https://movies.stackexchange.com/users?tab=moderators
- https://stackoverflow.com/users?tab=moderators
- https://puzzling.stackexchange.com/users?tab=moderators
- https://meta.stackexchange.com/users?tab=moderators