A user does not have to be a physical person. It might be the system or some utility that has installed its own user to complete certain tasks.
If you check the following Registry entry, the number you list show be listed and show what/who this user is. Maybe you....
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
If the Event shows any particulars as to the process number (PID) or thread (TID) it might be helpful.
Event ID: 1530 may be logged in the Application log on a Windows Vista or newer computer
I suppose you may need to shut something down before you shut down the system, or at least that what it looks like. The folders you see in AppData might be involved.