Deleting events in ZohoCRM Calendar does not delete them in gCalendar

Deleting events in ZohoCRM Calendar does not delete them in gCalendar

If I ad and event in the Zoho CRM Calendar, either directly or through the Zoho Calendar, the event appears in my gCalendar and my phone almost immediately.  I can happily amend any events and the updates appear in my in gCalendar and phone immediately also.

However, if I delete and event it is not deleted in gCalendar.  Is this the expected behaviour?

Cheers