Can you measure EC for your feeding? May some exceed of nutrients have locked few substance , and plants is stressed for...
I think it’s r/f so you can crop down male branches and go under flowering
Indeed you have some male plants. The plant on the second picture is a female plant.
I would kill those male plants before switching 12/12.
Wish you the best of luck.
Ya from your pictures it looks like the start of some males 100 percent kill those assholes if you don't need em lol .... You could see the ball on end of those pictures ...at least you have some females still . Cheers brother they look good