Thank you for your update.
Did you deworm them already? If not, I would advise to do so as worms make moulting even harder for the chickens and more so, when they struggle with some other not resolved issues.
After deworming you could provide them with a supplement containing Calcium + Vitamin D3 + Vitamin K and add some brewers yeast to their daily ration (up to 5%) for additional B Vitamins and amino acids, potassium etc.
Did you deworm them already? If not, I would advise to do so as worms make moulting even harder for the chickens and more so, when they struggle with some other not resolved issues.
After deworming you could provide them with a supplement containing Calcium + Vitamin D3 + Vitamin K and add some brewers yeast to their daily ration (up to 5%) for additional B Vitamins and amino acids, potassium etc.