Yes either they need more light, different feed or more calcium. My girls just coming out of molt and it's been dreary here so extra lighting of 1 hour to get them started some. the pullets haven't started yet but I am trying out a solar light rope later this week on my older girls and if ot works I am going to add on to the Cochins and hope for the best.
Feed - they have layers mash plus a little mixed grain as scratch (mostly wheat with a little oats and corn) with a few sunflower seeds.
Calcium they have the layers mash plus freely available crushed oyster shell.
I have noticed this week that the both of them seem to be loosing a few feathers - moulting maybe?
Quite tempted to see if I can set up a bit of lighting for them. Its so gloomy even in the day at the moment.