Unknown health emergency contact

I was checking the settings for the Health app because it has been accessing my contacts every day or so. (Probably a different issue than this.)

Anyway, I noticed that the emergency contact for my Mom was somebody I’ve never heard of with a phone number I’ve never called. Any ideas how that information got in there?

My partner checked her emergency contact and found odd selections, like a friend listed as her son and a distant cousin listed as her mom. At least the people listed in hers are also in her contacts.

Is there hacking going on?