Why is that? You'd think they'd have the same ratio of fit guys as the rest of professional sports by your logic.
Or.
Is it because the current highest earning professional bowler has a lifetime career winnings of $5 million by 2019? Since he turned pro in 1980. So if you can, you play something else.
Similar thing is going on here. There aren't people gunning for QA jobs specifically, there are people gunning for software related jobs in certain companies. People will get various offers from various companies for various positions. And the position you get is a reflection, in part, of the best offer for the best position the best company gave you.
So while the entire pool may have applied for the QA job, some of the people who were given offers got better offers from better companies and/or for better positions.
And let's not forget there could also be a variation of the Dead Sea effect going on. Where those who aren't Indian women get promoted or transferred out of QA at a higher rate, leaving more Indian women in QA. So you have twin effects going on. Where Indian women are getting accepted into QA positions more than other positions and Indian women being passed over for promotions and transfers keeping them in QA positions.