I appreciate the recommendation! I ran it through an epub validator and it showed that several of the books had errors. Since I don't have much understanding of editing ebooks, would you be able to break down an example of one of the issues that the epub validator stated? If not I understand as this isn't the right location.
Below is an example of two of the errors displayed as well as the relevant code. One of the books only had 2 errors in this case.
ERROR(RSC-005): ./books/Bo/databases/eBookIt/temp_uploads/1646250078.epub/content.opf(46,140): Error while parsing file: value of attribute "id" is invalid; must be an XML name without colons
code:
<item id="a26-chapter-19--order-(redux).html" href="OEBPS/text/a26-chapter-19--order-(redux).html" media-type="application/xhtml+xml"/>
and then
ERROR(RSC-005): ./books/Bo/databases/eBookIt/temp_uploads/1646250501.epub/content.opf(151,58): Error while parsing file: value of attribute "idref" is invalid; must be an XML name without colons
code:
<itemref idref="a26-chapter-19--order-(redux).html"/>
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