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I was looking at the WorldBuilding.SE Sandbox, and I noticed it was owned by a real user, unlike the PPCG sandbox. I clicked on the user's name, and this is what I saw:
Clicking on "Main user",
Why is this user listed as an OpenSource.SE mod twice?
As requested, the user is ArtOfCode.
We had a bug with a mod-only feature where it accidentally created duplicate profiles when used by mods who moderate multiple sites. There was no harm done here beyond it looking weird.
The profiles have been merged, so ArtOfCode no longer has evil twins...that we know of.