When I uploaded the same DNA kits originally from 23andMe, to Gedmatch and then to Genesis Gedmatch, I did an "X" comparison with a close relative. (both females).
The Gedmatch agreed with 23andMe results, sharing 91 on the 23rd chromosome.
But Genesis with the same DNA kits comparing "X" said no DNA shared.
That is a huge difference.
I am using this DNA to prove my biological grandmother, so it is very important.
Why would this be, and which is correct?