Soil too wet and temps too low can cause that, maybe check humidity too. Most likely though it will be fine and just needs to get it's roots down. A ton of early issues resolve themselves once the roots get a chance to spread out and take in more nutrients.
Not much else you can do at this stage, if they look to wet lay off the water, check your temps and humidity. I guess you could also keep an eye on the stalk, make sure you aren't getting any fungus problems or anything like that. There are some products that can help if you are having a stem issue. Most of the time people do more damage than good trying to fix anything at this stage though and way more often than not they just need a chance to get settled in. People get worried and water them even more or try to spray them with all kinds of crap or over fertilize, etc. I've seen more plants killed that way than by just letting them go. Make sure your temps, humidity and soil moisture are right and everything works out in the end so long as you don't kill them with fertilizer.
Oh and I guess I shouldn't leave out PH, I don't know your water situation but PH does matter too. My first thought though was maybe a bit damp and cold, the leaves tend to get a bit ahead of the root development when that happens and without the root development they can't get enough nutes to keep up so it can present itself as a deficiency.
