Did you also have them paired with something NOT under your AppleID? I had a pair of Gen1 AirPod pros that I had given to my daughter that did something similar. I had removed them from my AppleID but forgot to delete the pairing I had made with my work phone (an Android)Yep.
This was just the one day when I was traveling. The show on my 15PM.
I spoke too soon.
Got two more alerts. I am sitting in my office..
WTH?