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JanWolterman did you try any of the alternatives, see ==>>
https://www.mobileread.com/forums/sho...d.php?t=118605
I find that Mobicreator can sometimes produce a better result, its simple to use so there's not much investment in time - it will produce HTML, which can be readily converted to EPUB & MOBI.
But if its a PDF that you created, then you should be able to figure out what's causing the mirrored text problem in the tools you used to create the PDF - eg. Word, InDesign, Acrobat, whatever.
BR