Hi Getafix:
Problems getting out of the shell or genetics can cause a bi-cotyledon plant to appear to be a monocotyledon. Which is what this looks like. It is always fun growing a plant with an unusual start if you have the time and space and don't need the resulting crop. It is a crap shoot. It might be the best strongest, highest yielding plant ever. One that all of us want a clone of or a POS not worth the co2 it is breathing. Life is like a box of beans you never know what you're going to get. I had an eggplant that grew it's entire life with single leaves only on one side of a solitary stem - the plant never branched. It set as much fruit if not more than all of the other "normal" plants grown from the same package of seeds. Sorry I digress.
Seriously, Let grow for a week or two and evaluate it then.