Kind of disproportionate because at least 4 regions overlap Italy or and surrounding water and the North African DNA includes a very small section of Spain and about all of Morocco, Algeria, Libya, and Egypt.
Also Not 3 countries as the dominant estimate of 48.4% There are groups in the Phillipines alone like Igorots, Negros, Visayan that look nothing alike one another and speak different dialects. I’m assuming if they get anything with that match and Spanish, Portuguese, Chinese, or Mongolian they are labeling as one of those 3 countries. It is possible they are not showing up and defining the ethnic group as a blend over generations.
The Scottish, Welsh, Irish DNA could come from either side. Either is from the Expansion of the Roman Empire or is in greater percent included in some Southeast Asian blend or not included.