Leaf curl,downward

I have 2 plants,indica,sativa strains. The problem is the sun leaves are doing a curling down thing. I have them outdoors,15 gal growbag,foxfarm ocean forest soil,foxfarm nutes only. The PH is around 6.2-6.5 Is there anyone who can indentify this problem? I would appreciate any help I can get I was thinking maybe over fert? Whtacha think?

overfert or ph issues....when you say ph is 6.2-ish.....is that your water or your soil runoff?

it looks to me you maybe overwater.

pH is on the low side.

Also, how tall are those plants, and how many leads have they been pruned to? That's often a sign of a plant becoming root-bound in its pot.