Duplicate birthday listings in calendar
I have up to 3 birthdays for the same person listed on Calendar. It says I can't delete them except through Contacts. There's only one listing in Contacts; one person had multiple cards & when I deleted one of those, another birthday appeared. I deleted their contact card entirely, restarted the computer and they're still there for at least 2 people whose contact cards have been deleted. When I select "Show in Contacts," it takes me to the card adjacent to the former contact card.
MacBook Air 13″, macOS 11.7