Had some immediate family members do this, and get slightly different results.

It appears that some markers are attributed to one unusual heritage or another one based on your travel search history. 

Wish I was kidding.

Its all "the AI did it", of course, and dollars to doughnuts one of the AI's inputs is a data-broker's "ethnic affinity" assessment of your search history. Maybe literally Meta's "ethnic affinity" metric.

Entertainment purposes only, all population attributions are provisional, sign up to our neesletter.

"Gee Sarah, you've always liked Korean pop music, and gosh it turns out you might be 1/16th Korean. Now a word from our sponsors..." 

 Right, there’s no real verifiability for the user.