Man, not to offend anyone but those plants seriously look like they have some kind of disease or downsyndrome. I've never seen seedlings do that, and i've had quite a few seedlings. I'd start over if it's possible, you dont wana nurse a plant with bad genetics, not worth your time. you can start over and you'd really only lose a week or so, if you keep going with those you may or may not regret it. goodluck either way! also... check out "ducksfoot" it's a MJ plant with strange shaped leaves (not like yours) but that could possibly be something like what's going on with your plant, just my 2 cents!