So far I have written down about thirty DNA matches on MyHeritage who all share a similar block of DNA on Chromosome 1 on the MyHeritage Chromsome Browser. I am sure I could go on and find fifty or more others, but I am wondering what could be behind this pattern?
The block is always around the node, roughly in the same place as my cousin on my father's side, who I share 861cM, of which 24.3cM is on Chromosome 1 between 1061 and 1468 (it is a much longer number, but the first four digits seem adequate to label it with, and simpler).
Another close family match shares with me 20.1cM on Chromosome 1 between 1097 and 1468.
I do have other close family on MyHeritage, but they don't share this bit of Chromosome 1. Both these family members descend from the same brother of my father.
But I have many, many matches who also share this bit of Chromosome one, all between about 29 cM and 12cM, and all overlapping with each other, all around the node on Chromosome one.
There is even one person from Finland who I share 23.3cM on Chromosome one, between 1078 and 1472, and another person from Sweden who I share 14.5cM on Chromosome one, between 1129 and 1468. Other matches are from the USA, Australia, New Zealand, and the UK.
Is this some kind of fluke or will it mean that we share common ancestors somewhere?