How do I fix Apple Calendar's recurring event date shift and random sunday additions?

Hi,

I’m having a serious issue with Apple Calendar.

Whenever I try to move a recurring event to a future date, the calendar shifts it 3 days forward instead of the date I choose. It also randomly adds a Sunday event and removes one of the original weekdays from the repeat pattern.

This only happens with recurring events that have been running for a few days. New events work normally. All software is fully updated.

Because of this bug, I can’t roll my schedule forward, I have to manually delete 30–40 entries every day, which is wasting a lot of time.

Is anyone else experiencing this? Any fix?

Thanks.

[Re-Titled by Moderator]

Original Title: Apple Calendar Bug