@Popetthetreehugger
Have no qualifications in any related field , so completely disregard but great grandparents? 8 of them , so 8x13 is 104 % . Maybe paperwork family tree isn’t quite true 🤫🤐 plot thickens!
Obviously your entire DNA adds up to 100%. And you do get 50% from each of your parents.
But after that the percentages will depend on recombination. So although on AVERAGE you get 25% from each grandparent, it might be 24.5% from paternal grandfather and 25.5% from paternal grandmother. As you go back in time this can mean that although you are most definitely related to a gggg grandparent, you have no DNA from them at all.
The Ancestry "ethnicity estimate" should be taken with a bit of salt. My ethnicity shows i'm 88% Scottish, but if you look at the circles for how they define that, the circles take in all a huge chunk of Northumberland, Cumbria, Durham, Teesside, plus the Isle of Man and a big chunk of Northern Ireland. I have 3% Welsh, which also includes north Somerset, Merseyside, and the border counties like Gloucester, Hereford and Shropshire.
I have 2% Norway too - I think this is fairly common for people who have known ancestors in the north of Scotland. I also have matches (quite far down the list) with people living in Norway and Sweden.
The really weird one is when I exported my results to My Heritage. Their ethnicity estimate has me at 3% West Asian (Turkey, Iran, Iraq) even though I have no links at all to those areas and have never matched - even distantly - with one person from that part of the world.