When they were moulting, Janet, Edie, Mary, Ivy, and Peggy all changed their eating preferences and often went to roost without filling up first. They ate more of whatever they found for themselves in the environment and little to no commercial food. Because they were eating all sorts, the poops were very odd indeed. They went back to their regular eating habits when they were ready.
Katie's not on the list because she's never had a full adult moult, so I haven't been able to observe her dietary preferences. Same with Christa and Joyce.
It's normal. I was worried each time but I now think it's normal.
Is this what Snowy's doing? It seems likely.