Hello! I have 5 hens that are now 21 months old. Two of them molted this past December and are back to their beautiful feathery selves The other 3 haven't yet. Is this a cause for concern, or will the girls molt in their own time? I have a string of rope lights that turn on in their coop early in the morning to help with egg production over the winter. Is the lighting messing up their system? Any help is much appreciated! Thank you so much!