Automatically changes alarm

I have been using this calendar for several months and I loved it. It is very easy to add appointments.
The problem:
This is not at all reliable or consistent. For the last 2 months it has been automatically changing the reminder alarms that I have set. It will remind me of an event 6 days and 12 hours before it is supposed to (or some other random time like that) or not be set for an alarm at all.

MamaShani about QuickCal - The natural language calendar for iOS