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You have missing and or broken links. You probably have file name or case differences. You also seem to be using an img tag inside an svg tag instead of an svg image tag, but that is a guess.
Go install Doitsu's wonderful epubcheck plugin for Sigil and run it.
It will report these errors and you can double click on each to take you to close to the error's position in your epub.
Post a snippet of code from a page with the img area in it and someone here will point out how to fix it.
There is a Reports tool in Sigil that can help track down broken or missing links.
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