I have two users listed in my admin group. How do I get rid of one?

I have two users listed in my admin group, but the undesired one doesn't show up in users and groups settings pane. How do I get rid of it?

Well, I found a link which showed me how to find the hidden/unwanted user and get rid of it (remove hidden users: Apple Support Communities). Now when I get info from the drive on my network I find this:
Is this normal? I would expect to find something other than (unknown).

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