New to this

add my 5 cents just to mess those 2 😏😏😏 40+ years grower fart suggest to throw it away and start anew 😅😁😂 2nd half way right but suggesting that light'd be adjacted to temp and RH Are u F seriouse ? it's a seedling! u cant give it more then it can handle... another matter if it's early veg

There are a surprising amount of defects, but i think this is more likely a result of your "care." Some plants being healthy is never evidence you are doing things well.. you may be doing things fine, don't get me wrong. Just don't assume it cannot be your own doing as that's hubris and more times than not it is absolutely our fault, lol. In a context of a potted plant, outside of a genetic defect it's 100% us whatever the outcome is. Over time you'll know better if it was a rare genetic issue or something you are doing.. consistency over time is the key. Treating plants the same way is not always the right way. it's good enough as long as you have consistent results. Also, looks like too much light. When the leaves press each other upward on a seedling, that's generally the problem. Look up standard watering procedures for potted plants.. marijuana isn't anything special in that regard. fully satruate, wait for dryback, repeat. anything esoteric potential contributes to problems. Life is messy. They won't all be as robust as another, so some plants may power through such things with minimal negative impact while others do not. seedlings need less light, but quickly want more light... the growth pattern is an excellent way to judge this. How much light it can handle without abnormal growth or damage depends on climate, too... So, there's no one-size-fits-all unless you are comparing 2 contexts with exact same conditions. trial and error.. take notes.. use a light app to shorten the learning curve... you can measure intensity of light and try to match it in future. But again, if temp rh or ambeint co2 are not the same, you may need some slight adjustments from what worked in the past, but hoefully it's minor because at least some control over the climate is generally necessary.

1st underwatered, 2nd burned what soil u're using ? could be hot or empty