I remarked that the leaves , the first ones are turning yellow, or seem to be burnt or deficient… grow under led, any idea ? Or what’s it simply burnt by lights?
I'm going to say there's nothing to be concerned about here... it looks like they're touching the soil?? In any event, they are the very first leaves and are probably simply dying off naturally. If you were to see this start happening going up the plant, then you'd have cause to be concerned... but I would simply snip these off and forget about them... anything that touches the soil is going to potentially attract insect problems...
Good luck!