Thanks, Eric. After posting, I noticed that the same resizing issues occur on the SquareOne demo site as well, so it’s not just my site.
Go to http://demo.appfinite.net/squareone/ on an iPad (landscape or portrait) or on an iPhone 5s (landscape only, portrait is OK) and you’ll see that the background images of the buildings are all very enlarged, showing only a very small and distorted portion of the original image.
Are you sure the image is OK in landscape on the iPhone 5s? It’s zoomed and distorted on mine, just as with the iPad.