Setting reminders prompts Done, Postpone and Snooze buttons only
For one of my tasks, I set a reminder of once every 2 days. On my android, I get a reminder with Done, Postpone and Snooze buttons only. Hitting snooze pops up the reminder in some time as expected. But hitting Done marks the task as completed. That should not happen if the due date for the task is far out in the future, but you have just set reminders. There has to be an option to close a reminder without marking the task as completed.