Archive file has administrator's name in tab when opened

Occasionally I help users archive their email. What is odd is when the archive file is opened after I work on it, my name, not theirs, appears on the top tab in Notes. Even if the user closes the archive and reopens it, my name is still there.

Where is this tab name coming from and how can I prevent if from showing my name?

TIA.

Subject: Mail File Owner

Check More, Preferences, look at the mail file owner on the archive database.