Hello, zakari
I am sorry to say that this indicates a damaged font is embedded into the document. There is no error on our end, it is all in the document itself.
The glyphs you see visually on the page, are improperly mapped to different characters according to the font data. Changing the font in turn displays the actual text character, instead of an incorrect alternative.
You have already found the ways to observe when this happens, but to exemplify this, if you manually type this word into the search box,
image(1).png
you will not see this text from page 16 as the result. Instead you need to search for this string:
ζηνηρείσλ
image.png
Because that is what that text is actually mapped to read, despite what the font displays.
Typically, the best workaround I can offer for such cases is to perform our Enhanced OCR on the file (requires Editor Plus), with the "ignore page text" option disabled, so that the file is re-generated with new well formed text content. Unfortunately, I am not confident in how accurate it will be in your language here. I will still suggest you try it, but if the OCR results are similarly poor, the only solution will be to manually edit the text after changing the font to a locally installed option.
Kind regards,
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