Whenever is see leaves curling I look to see if any aphids or mites are on the undersides of the leaves. I also look to see if it could be herbicide contamination. And then I look at the leaves to see if they look like a latent infection of a virus.
I am not sure if the hot weather or advanced age of the seedlings could be the problem.
If it is any solace I seem to always find a few plants that just look messed up and most of the time if they look infected/damaged...they continue to look damaged and not pull out of it. I think there are genetic factors that throw off types. Sorry, but without pictures, I am offering possibilities.
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