I find that many archive dot org epub or mobi or PDF are poor unproofed OCR of scans.
Also they don't care about copyright. Likely that's why you have a problem. Their ebooks are often rubbish quality.
So I no longer download from there, only using it to find archives of defunct websites.
Use sites such as gutenberg.org and here that have human curated and proofed genuine public domain sites, or buy on Smashwords, kobo, Amazon etc.
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