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Well, all I can say is you cannot really trust Sigil to represent what a real ebook reader will do... and you cannot trust an ebook reader to do what a well-behaved HTML renderer should do.
To debug your problem, you could try un-hiding the different parts and adding borders, to see where everything is placed, but I'd say the issue is that the invisible "bottom right" part is scaled relative to the page width, and if the image width is different from that... well, then it doesn't match.
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