The "Ancestry Admixture" report provides a view of your origins based on five components. This view is different and does not have to match the one provided in the "Ancestry Report", which is the similarity to modern countries. The ancestry admixture study, conducted together with the University of Texas at Tyler and based on an article in Nature, starts from a large sample of different populations around the world and generates five groups or clusters (the components). There you can see how these components cluster well with the reference samples used in the study. For this reason, each "color" or component is given the name of the continent/region where it is most present.
The results we provide, break down your genome into the same components so you can compare it with those reference populations where you would be found. Do you have more "European" components than the average American? What we show here are your components, but it does not imply that you have close ancestry from those regions - notice that any band in the graph has a small amount of the other components even though they are reference samples from their regions! So if I am European, even if I have a relevant percentage of Asian, African or American, it does not mean that the ancestry report will show countries from those regions.
See more details in this blog article.