Sometimes the base font size is specified in the css, and it can vary considerably from book to book. Hence the difference you're seeing.
It's another stupid decision from the publishers, like the hard-coded line height and margin size. Ebooks don't need any of that, but they're still inserted in the css for no reason whatsoever.
That's why I edit my books. I remove any base font size other than 1em from the css. So all the books on my Kobos have the same body font size and I don't have to change it from book to book.
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