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It could be that specific HTML file with those resources aren't in the same folder as your other HTML files. So say your other files are in the OEBPS/content/ folder, but that specific file is in OEBPS/ folder, or in a misnamed location like OEBSP/content/ or OEBPS/contents/. This could cause those issues. Without seeing your exact file structure, that's all the advice I can personally provide.
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