The seedlings have been under humidity domes until 2 days ago -- and the leaf deformations happened while under domes. So I'm not thinking humidity is the problem. I'm thinking either the positioning of the light (which seems unlikely) or maybe a reaction to some of the early nutes & sprays. Really don't have a good idea.
Hey man, why did you keep domes on them? I thought the domes were only required while germing, as soon as first sets of leaves show they should be kept off permanently. Pretty sure that's why they don't look on point. What's the ambient rh in the tent?
Best wishes and karma dude