Leaves turning upside down

I noticed a couple of my leaves are twisting upside down and the very tops of the stems of the leaves on the top of the plant are turning purple. Is this a deficiency of some sort or is it normal. I just watered last night everything else seems normal. Soil PH 6.8 Plant water PH 6.8 temps are 88 degrees with lights on 75 with em off 38% humidity with light on, and a little over 44% with em off. No nutes because I have a half blend of MG Organic Potting soil and Good Earth potting soil. That has only been in use for a couple weeks. Both are pre blended with nutes. Moisture meter 3 inches down reads on the higher end of moist

I dont know if this is normal behavior or what?

heres some pics you can kind of see where the leaves were turning but I turned em right side up gently. You should be able to see how purple the leave stems are in one of the pics

Alrighty then, I have come to the deduction that this is not serious, or rather not a problem at all. Just trying to nip it in the bud if it was,

The stems were always green for the last 2 months, I figured it was a problem happening so suddenly and all.

your light is too close, the taco leaves are a classic sign of the tops being too hot.

Excellent thank you

your welcome!

They (8 26w and 2 42w cfls) were closer than an inch away, The plants have grown significantly in a couple days, I will be more vigilant about adjusting the lights now