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I’m confused

Tiny font size (at least in .mobi version)

Hi there, guys, I've just bought "React.js Essentials" ebook (, but its .mobi version has very tiny font-size. I had to set the last but one font-size value on my Kindle to read it.
I then downloaded its .epub version from O'Reilly site and converted to .mobi format myself using Calibre and the result was satisfactory - now I can read it with default font-size setting on my Kindle (I have Kindle Paperwhite, firmware version 5.6.5). Please help as I wouldn't want to convert every book I'll buy off your shop. Thanks!
BTW I'm not alone with my problem:
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