Why my leafs are thin ? Like really thin.

Its tough call , to me your plant seems fine and is looking like its well on its way to making you some kick ass medicine ! I notice that some of your leaves have a taco shape to them like they were suffering from cold stresses but I dont think thats the case , I think its the genetic here some plants carry very unique traits and Im thinking thats what this is , but you can also check to see if its wind related if your plant is having wind thats blowing hard on it it will also round up the leaves to allow easier air flow so it dont go flailing all over the play , you can fix this by simply adjusting your fan speeds . Over all your garden looks great no major problems that I can see , the only other thing I might suggest is to adjust the amount of times your feeding your plant with nutrients over looking the pictures i can see some leaves with the ends curled down eventually if left untreated the leaves will turn brown at the tips forming what we all call nutrient burns . to avoid this simply water your plants less often with nutrient water and feed with PH corrected water in between so you can lower you chances of having nutrient burns or toxicity's such as NPK it will also allow your plant to keep absorbing nutrients through the medium because you will always retain some no matter what . I hope this information helps you on your journey ! -Happy Growing!