I am working on a theme for Magento and simply modifying the base theme. When I am editing the app/design/frontend/base/default/template/checkout/onepage/billing.phtml file and any of the other files within the onepage folder it doesn't update the actual process of the checkout. Even if I erase the whole file the contents of that step on the checkout are still there. Is this content being pulled from another spot? ( i have cache disabled )