Only occurs when there are no reminders, and the app was completely closed before session in which a new reminder is added. Adding a second reminder, or deleting that reminder, fixes the issue.
Note that it only duplicates the cards, it does not duplicate any other data (as in deleting one of the two reminder cards deletes both, as well as correcting the issue).
Only occurs when there are no reminders, and the app was completely closed before session in which a new reminder is added. Adding a second reminder, or deleting that reminder, fixes the issue.