Hey, It looks like a magnesium deficiency, although it's tricky to tell if it's due to an excess of nutrients that have blocked absorption (too many salts in the substrate) or just a simple nutrient deficiency. Since you're in flowering, don't worry too much about it. I would do a couple of water-only waterings and then continue fertilizing normally, with your usual PK/booster, but in normal amounts. If you overdo the PK or fertilizers, the buds won't get bigger; the plant just gets blocked. Cheers!!

I think its magnesium deficiency, If your less than two weeks or so from chopping them down, dont worry. Even if you foliaar spray those leaves will stay spotted, it just wont spread. but if your close dont worry.

I would say probably some lockout so check your runoff ph and ec levels. If your not to close to finish then make sure those 2 element are in line. Cheers