hope someone can help, i have 2 isa browns and 2 australorps. and the 2 austra's will roost but my isa's wont. they keep going into the nest box and sleeping there. i take them out everynight and put them on roost and they stay. next night back in nest box or on floor. i am worried because i've been told they shouldnt sit on thier poo. to make matters worse, the only isa that is laying is no longr laying in the nest box now only on floor.my other isa is over 26 weeks old and still not laying.