Thanks for sharing the ASIN. There is something strange going on with that book.
Usually KF8 format is closest to what the publisher originally provided and KFX format is derived from the same source. That does not seem to be the case here.
For this book KFX contains formatting elements that are not present or are broken in the KF8 version. I have never seen this before and I don't know how it could happen. My best guess is that the publisher (Penguin) provided the book to Amazon in an unusual format (perhaps Adobe InDesign) that was then converted to both KF8 (badly) and KFX (better) by Amazon.
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