Hey CC! yes I have seen a few grow that way. It can either be genetic thing or environment like heat or not enough light your kinda look like a genetic thing. The plant and buds look great and healthy Most of the time its high temps that cause this to happen but your temps are good that's what lead me to think genetic and you lamp distance is good to idk maybe try lowering it little bit see if it helps just be careful to not burn the plant. Hope this helps Happy Growing!!