Yes, that is highly unusual.
When you microchip, you can add as many contacts as you want, just for the sake of upping the odds somebody will be there when the phone call comes.
[my dogs have 3 contact numbers/people]
Usually though, it’s an owner/co-owner/family member for the “extras”.
There’s a possibility that since the original owner died, the groomer was listed as a second contact.
At any rate, thank God she was.
Yes, our dogs are chipped but we only have family on the records. I guess the groomer would have accompanied this dog to shows so they thought it made sense to have her on the record.