I do not recall being introduced to a new moderator: user842563.
Can the moderation team comment?
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This happens every once in a while, though in this case it wasn't for the reasons it usually happens.
Someone made a small error in using our system to give a staff member a diamond and since the user is not staff, they appeared on the mod page. Upon seeing this post we fixed the issue in a short period of time (thanks so much for the report!) and we've since changed the system to prevent this from happening again in this case.
Apologies for the confusion!