The organizer's name is displayed twice
If the organizer’s name is added to the meeting subject, you can adjust the behavior accordingly in PowerShell. Before executing this command, you must log in to the PowerShell.
Set-CalendarProcessing -Identity RESOURCEMAILBOX -DeleteSubject $False -AddOrganizerToSubject $False
This will apply to all newly created bookings.
More information is available in the official Microsoft documentation.