My DNA about three or four years ago also came back as 14 or 16% Italian/Greek, although as far as I knew I had no ancestors of those extractions (unless it was thousands of years ago!) on either maternal or paternal sides.
The rest of DNA was essentially East European or Ashkenazi Jewish. Two years later I got an update telling me that my DNA had been re-done and it showed 100% Ashkenazi Jewish.
Likewise my wife's was totally different when redone two years after initially done. No request on our part to re-do the samples. Anyway, I lost any trust in any of the DNA promotions for genealogy.
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