Serated edges turning up

Tallest of 4 plants edges turning up all correct distance away from light any ideas ? New indoor growrr

Natural light pics when asking for help please

Raised leaf edges classic heat stress.

Here's a better pic 5 plants tallest yellow tips serated edges turning up all within correct distance. All the others fine. I've moved light up a couple inches hoping this will correct it any suggestions appreciated 1st time indoor grow

Heat
Light
Wind

Could fan directly on plant do this as temps low 20s and light above recommended height was lower tho