It doesn’t look overwatered to me and if it’s dry 2-3 cm under the surface it isn’t overwatered.
@myke might be right and the soil is a little warm. The first set of leaves burnt at the tips but the new growth didn’t so the plant got bigger and could use the nutes better.
Me, personally, I’m with
@Rurumo . That little LED is close. I ran one just like that for cloning and kept it about a foot over the lights. You‘re not even 3 inches above it at 7cm. But the new growth looks good, not burnt, so I think the plant hardened off to the light.
I don’t see your new growth getting too green yet so the soil is probably ok. Not much you can do beside leach the nutes out of it anyway. Were the first set of leaves praying/reaching for the light? That‘d explain the burns on just the leaf tips.
You’re using regular bottled water right? Not mineral or spring.