Smush Pro CDN – image and page width issues

Hi there. This evening I disabled our Jetpack CDN and enabled the Smush Pro CDN. I waited about 15-20 minutes, and after that time, the width of our website went from full screen, to having a white frame around it.

It's too much of a coincidence that this happened at that time. Could this be down to the Smush Pro CDN in some way?