There's definitely something in your CSS that's causing this problem, something that's causing it to be centered.
I also noticed you use this following code throughout your page:
I just wanted to point that this code doesn't actually do anything, there is no 'center' atrribute, only left and right. You can remove this code.
As for your problem, if you add the this code to the proper attribute, it should fix your problem:
You will need to play around with it and find out where it should go as im not familiar with your css.