I've been wondering about this for a while now.
Sometimes I see posts that confuse me, because at odd, unexpected places the gender pronouns are getting mixed up: girls and women are being referred to with 'he' and 'his', and boys and men with 'she' and 'her'.
At first I thought it was just typo's. But it happened too often like this, to be some random typo. And it happened in such weird places where instinctively you'd have used the right pronounces without a second thought.
Which makes me wonder: is it maybe that in some languages the gender pronouns aren't present or used in the manner they're used in the English language? So that when people from those places use English, they sometimes end up swapping the gender pronouns?