Why is it so difficult to understand? In OP’s example all top seven spots went to Asian girls instead of Asian boys. Its like flipping a coin seven times it all lands on the same side. The chance of that happening is 1/128! In another word, if only one of the twenty posters here in this thread observes such an outcome it is statistically significant.
One possibility could be that for early STEM admits girl to boy ratio is a whopping five to one or higher at those schools and all seven Asian boys and seven Asian girls are STEM oriented. There are not many statistically plausible scenarios.