There apparently isn't a set number of books displayed per screen in list view. Each book can take up a variable amount of space and if the information for the last book is not completely displayed (including its bottom margin) then it will be repeated at the top of the next screen.
On my Oasis running 5.14.2 when set to standard display size most book entries are 20mm high but some with a shorter covers are only 18mm high. I see five books per screen with an occasional partial sixth.
When set to large display size most book entries are still 20mm high but some with are 21mm high because of the larger text. That results in an occasional repeated book on the next screen.
Hopefully Amazon will figure out how to make this work more consistently.
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