Move 'My Account' Block

I am using the ‘cars’ template. Whenever I try to move the ‘My Account’ block (from the right hand side, to the left hand side, the page becomes wierd. All of the blocks on the left stray outside of the container.

I’ve tried editing the the actual file, and also making the adjustments in the Admin page.

If anyone can provide a how-to, or suggestion, it would be greatly appreciated.