plant looks great, verry similar to my bagseed plant. looks like you still have a few weeks to go though so that leads me to believe you have another issue with your leaves. maybe start a new thread and see what some of the other members have to say. i dont think its a N deficiency but it may be a cal mag deficiency, try watering in a teaspoon per gal of water of epsom salts or a cal/mag treatment for plants.
Edit: better yeat, start a thread and see what everyone else says before you go adding anything. i am not good with diagnosing plant problems and dont feel comfortable giving you advice like that.