What I did: created a reminder in a random note setting the d-date for coming Monday at 7 am. Added the reminder to my Exchange/Task list in the Reminders app. My Exchange account is syncs to my Reminders.
What happened: the reminder is correctly created in the Reminders app, but then new reminders with the same subject appears. The date is always set to Today 2:00 regardless of the date and time set for the original reminder. This addition keeps repeating until the reminder is deleted from the Agenda app. Ended up with + 300 reminders.
What I expected: creation of single reminder without duplication.
Things that might be helpful to know (Agenda version, OS and model, etc): running latest version of Agenda, IOS 12.4 BETA on iPhone X.