just looks like bad breeding. wyandottes have rose combs or the "smooth" ones. the "bumpy" ones you are seeing show us that they have been mixed with a chicken that has a single comb, or the typical kind you see on chickens with the long points.
as for sexing with combs, wyandottes are a little tough... along with this inconsistency with the combs, this should be pretty difficult for a beginner. you could post more pictures of all of them so we can compare them to one another. but the only advice i can really offer you is that comb size and redness is what really matters in sexing. rose combs are small and typically redder at a younger age. you may have to look at the wattles if they have any.
the bird/birds in the pics you uploaded look female to me, though.