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Are you giving a Magnesium supplement? Calmag, epsom salt, etc...
Like Booze said, check your ph, it may be low.
It's soil
Looks like a cal/mag deficiency to me, either its not getting any because there isnt any to get or the PH is off
https://www.growweedeasy.com/cannabis-plant-problems/calcium-deficiency
Depending on your environment and if its 3 weeks from the flip to 12/12 and you only have a few pistils showing you can also spray the leaves with some Epsom Salt diluted in water, I use a tsp per gallon. If its 3 weeks from the first sign of flower I wouldn't foliar feed.
I flushed and ph 6.5 watered next watering will be calm again how long should it take to see improvements the flowers on it are beautiful