You have an image that's 600×800 pixels, plus a vertical margin of 18 pixels. This doesn't fit the screen of the Kindle, which is 600×800. The Kindle probably sends it to the next page (fortunately, it doesn't do this again and again).
Even with no margin in the CSS, there's probably some default page margin in the Kindle, which would make a 600×800 image not fit anyway.
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