Jane Doe schedules a recurring weekly meeting. One person (of course the CEO) gets more than one calendar entry for the same meeting.
I checked the calendar:
Same meeting
Same time
Different docids
For some days the copies were all created and added at the same time, for other days the copies were created or added at different times. The only consistency being the created and added time being the same for a given document.
The only insight Jane Doe could provide is that it has happened when either:
Meeting scheduled for a certain time, the CEO was not available, the meeting was rescheduled, the CEO accepted, the duplicate entries appeared.
or
The CEO was uninvited then re invited, the duplicate entries appeared.