Image size and formatting with Upfront

I’m working on my (or site but I’ve noticed this problem on all the sites I’ve used Upfront for. The problem is that the formatting for cell phones leaves extra space below images. The pages look OK for desktop and table view, but when it formats for a small screen, the images appear large for a second and then resize smaller, but the text below does not move up, so there is a lot of blank space to scroll past. How can this be corrected?