If that setlist was active when you quit MobileSheets, then that's where it will open, which will automatically put the import in that setlist. To avoid that, don't right click the song, but launch MobileSheets from the Dock if you put it there, go to the existing song edit meta data window, then Files, delete the song, then click the + sign on the right to import the new version of the song.
Member Cali Rose & The CC Strummers; Bass Uke, Tenor Uke, Blues Harmonica, Tech Advisor