Check out the molting contest. Sometimes they look really rough when they lose their feathers. Poor things.
https://www.backyardchickens.com/threads/post-your-best-worst-chicken-molt-pictures-2023.1593891/
They usually molt around this time of year, but not always all together. I have a 4 year old Easter Egger who has never molted. Chickens can keep you guessing. :D What kind of feed do you give them?