Leaves clawing down and turning bronze

What nutrients. What strength are you mixing them? Keeping track of ppm would give you piece of mind, knowing you aren’t overdoing it. Just by looking at it with my uneducated eye I’d say cal or mag deficiency but it looks like it’s been going on for a couple weeks as it moved up top. So if it started and you tried fixing the cal/mag problem with your npk nutes it could be a lock out (too much). Try adding good microbes, I like Recharge. Maybe some dry amendments next run that way the plant can eat what it wants when it wants, up to you. It’s easier for the plant to tell you what it needs without the chemicals keeping it green. Basically if you added nutes back off and only water. Since you are in flower I’d suggest cal/mag or mag without nitrogen. The curl is usually an over/under water. Make sure you figure out your dry time (roots need air) by checking the weight of pots (indoor) and stick a finger in the soil to check moisture content 2-3inches deep (indoor/outdoor). If you decide to add a cal/mag or magnesium supplement make sure you allow your medium (soil, coco) to dry before. Epson salt is a cheap and organic magnesium.