I guess it’s just because that you have currently turned it of, right? But as from what I can see in the designer, in mobile view, you have your bg-settings set to non-fixed:
Problem with Google Chrome desktop view was fixed last night, suddenly it started work correctly. But all android gadgets do not shows body background fixed. So I had to add background pictures on every section, covering body . And even then, it doesn’t shows it fixed. Well, at least it has no white (no background) parts.