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Relax.

 

How to fix Cannabis Boron Deficiency (B) Pics & Symptoms
It looks like boron deficiency

 

Or light burn.
have you sprayed anything with the lights on?

 

It could he that a drop of water landed right down into the tiny, emerging shoot. These are pretty fragile at first, and the water drop acts like a magnifying glass and burns the new leaf tissue.

 

a little nute burn spilt is no biggey,...... the twisty leaves is a big thing, excess (N) causes the twisting, as the plant grows (N) is consumed the twisting clears, avoid over feeding

good luck