App synced to calendar won't delete
I had a recurring task that was synced to my calendar that I have completed and deleted in Todoist, but will not delete in my calendar.
Please tell me, is the calendar you're using "Google Calendar"? If so, please note that they are synchronizing iCal feeds only once a day so any change you make in Todoist will be reflected there a day later.
Unfortunately, that's how they're set up their servers and even though our iCal feed is live, there's not much we can do about it at this point, but we'll look into alternative calendar integration solutions specifically for Google.