Klean Theme – issue with header image on iPad

It’s a beautiful theme and very well done. I activated it for a website. The full page header image is responsive when I resize the browser window manually using Safari and looks great. When I checked how it would look on an iPad, the header image loaded OK the first time, but then reloads too large (at full size) when the orientation is changed from portrait to landscape or vice versa, and stays that way. The header image I used was set at 1440x900px as recommended. I noticed it does the same with the header image on the Klean demo site, when I viewed with my iPad.