calibre resizes images to fit on the device screen, but if the images are offset, i.e. if their left edge is not at the left edge of the screen, then they will go off. Or if the html includes a width="100%" directive and the width of the body is larger than the screen then they will be stretched by the reader.
In such cases, the problem cannot be automatically fixed, you have to tedit the ebook using software like Sigil.
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