Looks like Nitro burn to me. In the picture with the leaf mottled, on the edge of the leaf it looks brown and crisped ? but I don't see that in the other set of leaves are they two different plants ? or are we dealing with the one plant ? Is the leaf up high or a lower one ?
If you suspect nute problems then give the plant a good flushing or two, and check your light that if your hand is just on top of your plant does your light burn your skin ? if it does then your light is too close.
Thinkin good thoughts for your grow
smoke in peace
KingKahuuna