The system brought in an "already sent" reminder that it rejects, now I cannot save edits

Regarding event:
https://advancements.scouting.org/events/editEvent/5667659

It records a reminder already sent 1128 hours before the event.
When I edit the event, and click save, it flags this as too many hours.
I cannot fix the flagged reminder and I cannot edit the event. Help!

are those old ones that have passed?

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