When I want to add a reminder, it sets it to some date in 2016. weird.
Unfortunately, "in 20 minutes" is not a valid due date for nether tasks nor reminders. Please try to use standard dates such as "today at 2pm" or "in 3 days @ 16:30" etc.
I understand that you do not currently support these kinds of dates. But then the app should say "invalid date" - not add some reminder in 2016.
We'll look into disabling this date format in the future.