2 problems please advise

Hey, hope someone can help me sorry no pics. I have this Mazar (freebie from seedboutique) and the leaves at the top are curved inward like an upside down canoe?!?!?! kind of like a claw and also they are very thin... anyone know what this could be? The other Mazar is bushy and healthy with superthick leaves... also, I have a Mikado and that has been the healthiest plant ever and now the leaves at the top are very thin while all the other leaves are thick.... Im confused... btw they are about 3 weeks into flower under a 400hps, they are getting FF complete line of nutes at 1/4 strength.. Im confused.. this one mazar has never looked as good as her sister but the Mikado always looked perfect and now these thin upper leaves... it still looks healthy but why the thin upper leaves? its making me nervous. please help

I had the claw last grow. I never completely figured out what the cause was. I had 16 plants, and only 2 had the clawing leaves like you described. The only thing that seemed to help was a teaspoon per gallon of hydro peroxide. I flushed with that, and then let it completely dry out before watering again, and it improved a bit.

Hey thanks a lot SenorSanteria! This claw thing is bugging me cuz they always look so good and now I look at the one with the claw and think I should just 86 the girl. Did your clawplant end up producing some dank herbs still?

My clawplant was a pure sativa. The smoke was beautiful tasting- smelled just like Juicy Fruit. It just wasnt a big producer. It produced about half as much as my others of the same size. If you can figure out for sure what that claw is... please let me know. Does it look like this?

Yes just like that! Except mine has the thin claw on the top half mostly. How strange. Well, I guess since I will have the room I will just keep her and see what happens at this point. Hey thanks for your help