I'm new to chickens myself. So don't take my advice like I know whats going on. As of what I can see in the picture, the roosts are difficult to get to. Also I don't know what is outside of your coop, but inside there isn't anything natural like. Could it be they are at the door because outside is life, and inside is a box. Also the light may be to warm for them. It gets about 50 degrees where I am at night and when my chickens were about your age, they bundled up together in there roosts. No light, just each other. I had 15 at that time and they roosted in 2-3 groups on shelves. Maybe they were a bit cold, but they survived the cold. I personally would try putting a few climbing boards to your roosts, then possible a large flat near the underneath of your roosts. Something simple and not permanent to try and understand what they are or aren't communicating to you. Like this.
---l
---l roosts
---l
---l
-------- board underneath roosts
--- mid way up
--- near ground
It's easier for them to hop flight in there perceived small spaces, than it is to full flight.