What lighting are you putting them in ?
Might be an idea to give some extra tests/tries with odd light schedules.
Seeing as it came from flowering, it could require the dark periode hormones somewhat still after the cutting.
How about giving them something like 10/14 for a few days or week, perhaps followed up by slowly increasing the light times. (slower transgression from flower phase->veg phase)
Just some thoughts
quote from davincis demons: revolutionary changes were preceeded by radical ideas