I just went out there (it's just getting dark) and none were in the nest boxes-all were on the roost. So apparently it's not a nightly thing. I wonder if maybe just checking every night and kicking her out if she's in there (not literally-don't worry) each time will curb her of doing it.
I wonder if a ramp would help. Maybe someone is getting too fat to get up there?
I tried watching them but they wouldn't go in when I was out there (apparently I'm too tempting since I toss in treats) and it was FREEZING cold.
dh had to collect eggs after dark the other day and there was a chicken in one of the nest boxes. It was dark so he couldn't tell which one it was. So that explains why there's been so much poop in the nest boxes (and almost always at the very end of it which supports a roosting chicken in...