Check this article out:
https://support.apple.com/en-us/HT206999
If a reminder coincides with an event in your calendar, like a meeting, if you're moving or exercising, or if you start a session on your own, your Apple Watch reschedules your reminder. You’ll get the reminder a short time after your event is over or you stop moving.
So I just deleted some events in calendars and will update if that works. I had events scheduled for all day so hopefully it works.
Series 2 w/4.2
7+ 11.2