Crinkled Tops

Looking for some help! Very healthy girl until it was switched to 12/12. Plant has been in flower 1 week. PH is at 6.0 and ppm is 1050. Put it under a more powerful LED for flower and I think it may be heat or light stress. Temps are a little warm at 78 and RH is also sitting a bit high at 55%. Only the tops are showing this problem

I would appreciate any and all tips/help provided. Thanks for looking

Anybody? I'm a beginner and could use some insight

What is this plants genetics? I have a critical sensi star that looks a lot like your pic. I have two css one pheno looks normal, the other has the weird tops, but once the leaves get bigger they straighten out. I am clueless to what the cause may be also.

It is a cookies kush feminized seed from Barney's farm. Was not doing this during veg at all. The cuttings we took all seemed to exhibit the same characteristics with the crinkled tops though