Blattwuchs

If you have allowed it to dry a full 1" each time, water just a tad sooner early on, maybe (or if soiless, just a tad earlier than what you've done). I guess that could be an effort to conserve water by cupping and reducing surface area hit by light... could just be normal immature plant too. If it doesn't perk up from that, probablay not...

Likely grow out of it, i wouldn't worry. I've seen far uglier genetics early on that turn out beautifully as any other plant does. twisting of one leaf, asymetrical, weird blemishes on early leaves etc etc... things not likely related to nutrients due to isolated presentation of symptom and healthy otherwise. Looks healthy, so you likely haven't overfed... using common sense like that, assume early issues will go away with time. Only worry if it spreads or worsens.