how long after the transplant into the coco did this happen? You went from a substrate with a ph of about 6.5 to a substrate where the ph is much lower. you're going to have some lockout going on - calcium and magnesium, until the plant adjusts and adapts. I clone in damp coco and if i am replacing an old mom,, I drop the clone in coco directly into soil. I get some twisting and some color change but it's temporary and plant adapt quite nicely.
hopefully yours will as well.
I use ladybugs as my canary in a coal mine warning system. My entire grow was decimated by broad mites. if I get something that looks like bugs are getting my plants, I pick up some ladybugs and release them into the garden. If they get bored and starve, then i know my plants are clean. However, if they find nothing to eat, they do die. they last maybe a couple 3 weeks or so.