Something wrong with seedlings..?

Seeds from hermie plants will turn out hermies too............and be inbred with genetic deformities...........a bit like marrying your sister. New plants = new soil............never re-use old soil.

Nodes look a bit tight, i'd reduce light slightly - maybe, -10% and see how it goes for a week or so. These are from a "selfed" plant that hermed on its own? This can impact vigor of the next generation. inbreeding has a negative effect quickly. It's pretty easy to give a young plant too much light, then that carries over to next stage of life with a slightly stunted plant even if it can now handle more light given a slightly better start. I just did it to a few seedlings. The ones that sprouted first needed more light to stop stretch, but then the ones that sprouted 1-2 days after were given a bit too much light too soon. Now, they sit off to the side and cross fingers they snap out of it quickly. The "tacoing" is usually environmental - temps, rh, direct fan with too much wind etc. the soil probably didn't get up to 8.7. Leftover nutes (what's left, albeit low EC) likely lowered it a bit. The plants look like they are ready for some sort of fertilization with some chlorosis working up the plant. The first 3-4 days can't be too big of a deal. they germinated, so they were relatively fine despite not being in a more optimal pH.