@Limeso - why are you converting what appears to be EPUB 2.0, which is a flowable format - like a web page, to PDF which is a paged format - like a printed book.
There are numerous EPUB readers for MacOS, Windows, Linux, IOS, and Android - there are some that can read both PDF and EPUB. Format shifting (conversion) is never perfect in any media - if you can, it's best avoided.
BR
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