If Y-chromosome haplogroups change, does that mean my results are wrong or inconclusive?
No. The results of a Y-chromosome DNA SNP (single nucleotide polymorphism) test are definitive and are not subject to change. If you have taken a SNP test to determine your haplogroup, your SNP test results, likewise, are definitive and are not subject to change. What has changed is the name of the haplogroup to which you belong. This change reflects advances in scientific understanding of the way the male (Y-chromosome) tree’s branches fit together. These changes are prompted by discoveries published in academic review journals and from initiatives like the Walk the Y (WTY) project. Additions and changes to the tree are reviewed by the Y-Chromosome Consortium for correctness. Regardless of the method of change, your actual SNP results have not changed, and your new haplogroup name is a sign of greater accuracy and specificity in identifying where you fit on the Y-DNA tree.
