I submitted my DNA raw data and then the results showed some strange matches, like high DNA match (1st do 2nd cousin) but with no evident relationship with my country. In a particular match, I re-check our relationship in GEDmatch and there's no relationship at all!
Is it possible that matches were calculated wrong? What should I do?
I'm actually digging through the forum for open/pending questions/problems. And I've seen, there aren't any answers to Your Post.
Allow me the question: Does the problem/question You described still exists ?
If yes, please send any problem & questions around DNA/Ethnicity as an email directly to the support (firstname.lastname@example.org). In the title of the email place somewhere the word DNA, and this will forward quickly to the DNA support team.
Take a look on the following Post from Yehudah (MyHeritage):