Yes they all molted last winter and starting at winter solstice the control started adding extra light at a rate of 5 minutes more each day up to 14 hours of light. I guess due to their birthday being 8/16/17 that it shifted the molt to later in the winter... dunno sounds plausible.
Speaking of molting, Molly is molting like crazy right now.
And the latest chart as of today. Top chart is percent laying by month and the bottom chart is the average egg size with their age in months on the bottom row.