Since the are comin from a flowering plant. They are trying to figure out what to do (revert back to veg or continue to flower). adding two more hours of light will help them realize it is veg and nothing else. Second reduce your ppm's they are babies. this will help with the leaf curl you see. they still need to eat but no so much. DO NOT prune or cut anything. they need to work it out without distraction. the new growth will look alot better. then you can remove the abnormal growth i didnt see any fans in the pic's, but if possible let the fan air bounce off the walls, floor and travel through the plant. you will pick up some co2 that way. While ruling out any fan disturbance. Just my 2 cents