1) Yes, the book isn't from Amazon. The original book's source is in ePub format. In the Kindle is loaded the MOBI version, converted with Calibre.
2) No. The gap is the same, no matter how the font is resized.
Inspired by your arguments I converted the book to AZW3 and the effect does not occur. So, it's something related with the MOBI format.
But this is still curious, once that it only occurs with the Bookerly font.
I sent an email to Amazon reporting this issue and they replied, asking me to talk through phone or chat with a representative.
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