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In my calibre setup, for the viewer customization, I have the # of columns set to 1 and did not see the issues you saw.
Otherwise, epubcheck was not happy with your test ePub. I changed the naked img tags to using an SVG wrapper (my preference for cover and other full page images) and a bit of other cleanup. The revised ePub is attached to this message.
I've attached the modified ePub and some images from calibre's ebook-viewer.
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