Brown patches, don't seem uniform to outside of leaves.

Any ideas?

Soil: Happy Frog
Nutrients: Dyna-gro pro-tetk since week two, foliage-pro once, very light on feeding.
Lighting: LED 600w

I did lower the lights 3 days ago. I'm not really pushing any limits but that's been the only change. Some of the new growth looks a bit twisted and some other leaves have curled over.

Any advice is appreciated.

And only affecting 2 of 6 plants.

Inadequate cal/mag. Easy fix.