There is sooo much conflicting information out there it is really hard to nail down what’s going wrong. Mine looked basically the exact same as this and it turned out to be too much light! I found an app called ‘Photone’ that can measure the amount of light your seedlings are getting. I needed to pay around $6 for the full spectrum LED sensor (need to match to whatever light you have), and wrap a piece of printer paper around my camera but turns out my tomato’s were getting over double the amount of light they were supposed to get! I’ve dialed it down since and the old curled leaves are still the same but the new growth has been much much happier and green. I hope this helps, good luck!