It almost sounds like there's an anti-tampering (i.e. counter-mutagenic) system in place we don't understand. Makes sense. Not only is meiosis more error-prone than mitosis, there's also a wide difference in error rates between the sexes (40 to 60% for women and 3% for men) [1].

[1] https://books.google.com/books?id=I1ACBAAAQBAJ&pg=PA9&lpg=PA...