So I created New year’s day and set it as a yearly reoccurring event. All good.
Except when I clicked to edit it to add a category I forgot, it said daily and I did not notice. Clicked submit, and boom, it was daily. Edited it again, changed it to yearly and submitted, and it fixed it. It is correct in the database.
After fixing it, I clicked it again. It loaded fine. Clicked close.
Clicked it again, fine, closed.
Clicked a different event, it loaded fine, clicked close.
Edit: If I only ever click New Year open and closed, it is always (well after 15 times) correct.
I clicked the business hours which is in the DB as Weekdays (M-F) it loaded poorly.