Interesting to see the difference between you and your brother and how your parents score. You get almost 2% East Asian on it.
With my largest converted data (23andme V3), I get 0.51% Malayan (I don't think that's fully East Asian) and 0.01% Volga-Ural.
Also, my West Asian score is also lower than what you get, 11.51%. Although my North Caucasian is 6.38%. The only thing I can't understand is my Italian score, over 13%, high asf, but afterall I'm a med guy so idk..

