I have 5R I R hens who are approximately 20 weeks old. They have been sleeping out in their henhouse every night for about three months. This last week I keep finding 2 to 3 birds sitting up on top of their henhouse at night instead of roosting inside. These three girls are the more dominant birds in the flock. Any suggestions on what I should do? I have been going out at dusk and putting them on the roosting bar before bed. Sometimes they jump off the roosting bar and then come outside and climb right back on the coop house again. I know some of them did that last night as I found a lot of poop on the roof of the house. The hen house is completely fenced in by the run.