The short answer is that the code in the epub is probably saying to put the image there. It could be there is an error somewhere and that the calibre viewer is more forgiving than either of the renderers are on the device. And it definitely is more forgiving than the RMSDK used for epub.
To really say, we need to see an example of the code. If they come from somewhere we can freely download, then post a link. Otherwise, post a sample of the code and the stylesheet.
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