Why does outlook's birthday reminder repeat after each contact is saved?

The birthday reminder feature of outlook was recently found. The birthday reminder is also a unique feature of outlook. When your contact information contains a birthday field, a cyclic event similar to a holiday is automatically generated in the calendar to remind you.
However, I found a problem: Every time I modify the contact information and save it, I will repeat the cycle time of a birthday reminder. After a contact is deleted, his birthday reminders are retained. This is inconvenient for use. First, the contact information cannot be saved only once. Second, if the contact is deleted, you must manually delete the birthday reminder time in the calendar.
I wonder if there is any solution.