Why Are Niger-Congo Peoples Modelled by Homo sapiens Coordinates More Accurately Than Others?

The results that are shown below were generated via Vahaduo with these coordinates. As you can see, Niger-Congo peoples (West Africans & Bantus) are among the farthest from the Homo sapiens coordinates, but they are modelled most accurately by the Homo sapiens coordinates when combined with archaic human coordinates. Why is this so?

Distances

Ancestry Models