Changing behavior after click on "Add to Cart" button

For whatever reason, I'm getting a weird AJAX behavior when I click the "Add to Cart" button on one of my product pages. (You can try it for yourself if you go to and pick any of the items.) When you choose an available option and click "Add to Cart," the entire quantity field/add button/variant dropdown disappear, there's a weird green flash, and then the field and button reappear.

I'd really like to make that not happen; in fact, I'd love it if clicking "Add to Cart" took one directly to the shopping cart page. Is there any way to do that?