If that book is an Amazon purchase then knowing which book it is would be helpful in determining why this is happening.
I am guessing that the book's content is organized as a table for some reason and that is enabling this behavior described in the Kindle User's Guide:
Quote:
Tables
Enhanced viewing is available for tables that are interactive, enabling you to both pan and zoom. Tap on the table to display the panning and magnifying-glass icons.
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