Ok but we don`t see any code for background images, just for background color. If for one of page you don`t have any background setup, then instead just color shows - white color what we see in code above. Maybe you setup something wrong? Do you use the same background image in header for all pages or different images for different pages? Because if you use the same for all pages, then you should setup it in Theme options > Layout > Header section and there is field called "Subheader image". But if you want to use different images for different pages, while page creation/editing, on the right side you have field called "Featured image" and there should be image uploaded.
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Hope this will help you!
we do not have an option for background images on pages, did you do it with custom css?
thanks