Airpod Pro and Airtags associated with my AppleID where picked up by another person's iPhone.

I know it sounds crazy.. but I've had AirPod Pros and Airtags for a while (over a year) and are associated with my AppleId account but someone else's iphone started getting alerts about my Airpods and Airtag on their phone. In fact, when I took their phone, used Find My, and clicked Items on their phone and pressed sound.. and it sent a sound to the airtag! WTH?

I took the battery out of the airtags and reset the airpods, so they don't currently appear on their phone, but how is this possible?