[zozbot234]

This is unsurprising. Wholesale genetic replacement basically doesn't exist unless there's a huge plague that kills 90% of the population or something (this happened in the Americas when the Europeans arrived, there are other cases of it in history but it's plenty rare). From an ancestry perspective, populations tend to be derived from the people that were there thousands of years prior; cultures and even elites can spread and migrate and cause huge material changes, but the bulk of the people just stay put.