If your tasks seem to duplicate ie copies – eg “Google Tasks” start appearing / showing up:

The most likely cause is a time zone or connectivity issue between Dooster and Google Calendar.

OR because the system importing”Google Tasks” from Google that don’t exist in Dooster – as a result of a time sync bug in the Google API. Unfortunately that is out of our control. Simply mark those tasks as complete . Or you could delete the Task List where they appear

Are you or any of your users using the Google Calendar Sync feature?

Check these related articles:

https://dooster.net/wp/troubleshooting/completed-deleted-tasks-reappear/

and

https://dooster.net/wp/known-issues/completed-tasks-reappear/