How old are they? It sounds like you don’t have mature hens and roosters but instead have immature pullets and cockerels. Adolescents don’t always act like adults. The age of the males and females is really important in how to answer your questions.
What you are describing sounds like typical adolescent behavior, probably somewhere around 4 to 6 months of age. The boys’ hormones are running wild. Those hormones have the boys wired to the gills and they don’t have the maturity to deal with it. Some pullets may have just started laying, maybe, but their hormones haven’t really kicked in yet. They don’t know what is going on yet so they won’t do their part. Still, they may be sending signals to the boys that they are mature enough to attract attention so the boys look in their direction and ignore the less mature ones.
There are other things going on too, both with the mating and one cockerel knocking the other off. Mating is not just about sex, it is also a dominance thing. The one on the bottom is accepting the dominance of the one on top, either willingly or by force. The cockerel knocking the other off is demonstrating his dominance to that cockerel and the pullet. The pullets are not willing to accept that dominance so they try to go where the boys won’t bother them, up on the roost.
I’m guessing of course since I don’t know the ages. If it is adolescent issues they will eventually work it out, but it can be messy and unsettled down there until they all mature, pullets as well as cockerels.
