Twins get different results when they put 5 ancestry DNA kits to the test
You don't need twins for this test.  A single person can just sign up twice for these services and get different results, even if they make a single sample and split it between the two vials.I thought it was pretty well known that these services are estimates only to a large degree?  These services only take samples, they don't sequence the entire genome.  Of course there will be errors when you have to extrapolate from a sample.Even for me personally, my results changed when my parents did it and linked up to me, because their results were able to flow into mine.