“There are 5.8 million Jews in all of Israel according to the Israel Central Bureau of Statistics (and that’s including their overcounting with non-halachic Jews.) Of those 3 million are Ashkenazim and 1.8 million are Sephardim/Mizrachim according to the Israel Central Bureau of Statistics.”
You first quote 5.8 million, but your numbers add up 4.8 million.