I’m having somewhat of a similar issue, I have 4 older hens that are 3 years old. They are the “top” hens in my flock of 16 tow of them being roosters. I know 4 of my younger pullets are laying and my older top hens are not. With that being said my top hens like to hang out in the coop sometimes during the day and scratch around in the bedding(hay) and when the pullets come in to get into a nesting box to lay they chase them out. I’m at a loss on what to do about it. Some of my pullets won’t even go in there when the top hens are in there. Any ideas what to do????