My sister had one of these bogus DNA tests run. It seemed to have missed our maternal great grand mother who was 1/2 native American.
Yup, either it’s a fraud, or sloppy technicians don’t want to bother doing the actual testing and fudge the tests. I have a nephew who has two grandparents who are French/Indian, and two who are Syrian...and he showed up as l/2 Syrian and l/2 Scandinavian. Gave us all a good laugh.