If your newer top canopy looks nice an healthy I wouldnât worry about it, if you did have a deficiency of some sort itâs been fixed now Also how close have you got your lights could be a sign of heat stress by the looks of your leaves slightly curling upwards either that or over watering... with saying all that I am new to growing myself just giving you a few hints a what youâre problem could be hope someone answers youre question abit more precise for you haha happy growing good luck đđ»âïžđ»