Checkout processing – weird white overlay

Instead of a processing pop-up or some other notification, when a user clicks the checkout and proceeds to make a payment, the screen goes from the usual dark view (Picture 1) to the view with the white overlay (Picture 2)

Picture 1: http://gyazo.com/2bd888ed268905b583c6e560e83862df
Picture 2: http://gyazo.com/dfac161afa566f76c7e74c75d5027628

I’m not entirely sure why this does this, but the white overlay also occurs on the actual checkout page before making a purchase when it seems like it loads in the products that were on the cart page. It doesnt last near as long, so its hard to get a screenshot of it, but the overlay occurs here:
http://gyazo.com/22f682eb6d06141e6af39105511f8c97

Is there any way to change this overlay for the LOADING to be non-existent? We don’t want the white overlay for the “Your Order” section and would prefer not to see the random white loading overlay.

For the purchase overlay, is it possible to have a “Processing” image or something else show up instead of the white overlay?
It looks pretty bad on a dark website, and doesn’t really tell you whats going on.

Please advise on what can be done.