Ah lack of space could well be it. They will now have a coop 3 times the size of the old one and less friends.
My partner moved them as soon as I read they needed to be quarantined. Might be too late. My sister in law said just put them in the coop while the other girls were in the yard...
My sister in law gave us 4 chickens last year, today I went back to her and got 4 more. The ones I picked up today look unhealthy. The feathers aren't shiny and lustrous like my first 4 and each of them has chunks missing, one her head is bald another's butt is bald.
Have I brought lice or...