It is not always so but with Moroseta I (and other breeders of Moroseta) have had it several times with young hens first deposing. We opened the eggs and looked but not found that germinal disk (which is the real female egg).
Point is, I breed only Moroseta so I not know for other races, but I suppose it could be similor for the other races young hens eggs.
So my dear Rachele, not point directely to the males for the culpa ;-)