I'm having the same problem, but only since I removed the taller roost that was above the nest boxes. There's a chicken ladder up to this separated off area with pine shaving floor.
My largest chicken got bumblefoot, and when I read up on it I read that the roosts shouldn't be higher than 16 inches to discourage the bumblefood (also disinfected and sanded down the roosts). I had heard the chickens jumping off the roosts and they sounded like they had a hard landing, so I decided to take the problem of too high roosts out of the bumblefoot equation.
Also have new hens, so now none of my 8 chickens are laying (winter starting here, and no artificial lighting . . .). Everyone wants to crowd up into the separated roost/nesting box area, even though I put the other roost in the open pen part of the coop. I put in plywood boards to make the pen part less windy, and more like an additional room, but none of the hens want to sleep on it . . .
I guess I need to completely close the guillotine door to the nesting box area at night, forcing everyone to move into the pen area. Maybe put another roost there?
Anyone have any better ideas? I do want to encourage the hens to lay eggs --- but no poop!
Thanks for input.