I have had this happen before and she ended up growing fine the rest of the way. It's almost like she is using some nutrients from the leafs to accommodate fast root growth.
I am no expert with LEDs, for small girls like this I use a blue spectrum CFL, one bulb true 48 watt or so. Not sure if your light is burning her.
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Yeah I moved the lights way up now to about 3' will see how they do over the next day or so. Going to give them a nice watering tomorrow and hope for the best. I think from my research it might be the light.
Your leds need to be 24 to 30 inches for small seedlings..
12 in is waaay to close.
Also your soil is looking really wet like igronao said...thats why the leaves look that way..overwatering..
Pot loves to grow in moist to dry soil.
I know you think they need water but let the pot dry out before watering each time.
Good luck bro.!!