why??

i recently acquired a 2011 specialized langster. the bike had very few miles on it when i got it. i have a terrible habit of riding with no hands. the first time i let go of the handlebars on this bike, it immediately started to lean left and i had to grab the bars to regain control. ive had a bike to this to me in the past, but it was an old crappy bike, unlike this new one.

what could be causing it? everything - the wheels, the bars, the seat - appear to be sstraight and flush. there is nothing else in there that would make it obvious. i have been able to ride it no hands since, but i do have to counter balance a bit.

help me understand...