you are getting asymmetrical growth really early... not necessarily a bad thing on its own.. it is inevitable growth pattern once they age a bit.
Now, if some sort of stress can cause that? i don'tknow... the plant is a proper color, internode length is fine...
If it didn't have the cotyledons and incremental increase in lobes from first nodes on, i'd guess this was a clone due to the growth pattern.
Since it is healthy-looking, i'd just chalk this up to genetics. Supposedly asymmetrical growth hurts yield... but i think if they did a real scientific study, it'd be miniscule difference at best. Probably end up with similar # of nodes per inch of stem etc... it just isn't symmetrical anymore. could make certain training techniquest more difficult... e.g. mainlining wouldn't be good for a plant that immediately goes into asymmetrical growth pattern, i would assume.