Duplicated calendar events

Scenario:

Google Calendar events are being duplicated with unintended guests, etc. Events are added through Google Calendar App on phone/tablet.

Explanation:

Google Calendar app now suggests previous events with previous guests as you're creating a new event. If the user clicked one of these suggested events this may have been how it was duplicated.

Solution:

Do not use suggested events unless you are intending to duplicate an event with the same attendees.