I go with genetics, if they are clones. I have had weird leaves from a couple of plants, but not 3 or four in the same group. If not clones, no overheat, standard soil and nutes, then it might be a mineral def, but very rare in an outdoor grow. I would use a foliar spray with a seaweed base ( Maxicrop) for added minerals, but after that, all the bases should be covered. Good luck
Nope, no clones grown from seed and two strains. I'm actually using coco medium with coco specific hydroponic nutes. I guess I could try a foliar spray also. Ty