Those coops are small and stuffy and the run feels like a part of the coop to chickens so many will take to roosting outside. Chickens do not like being warm.Interesting. I have a similar problem. My chickens had been very well trained to get into their coop when the sun went down and then their automatic door would close. Worked very well until summer solstice when sundown started happening earlier each night.
Now, I find them out on the run's roost bar (right side) each evening. The girls have totally lost their earlier behavior to get into the coop at night around sundown. They seem content on that roost, but the coop is better protected, so I want them in there. Given the description above, I was thinking maybe a mite/lice problem, but they have no problem going in this same coop during the day to lay eggs or sometimes just to hang out.
I'll still check for lice/mites tomorrow. Thoughts?
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