I would restart the Kindle via the menu. If that doesn't help, a Factory Reset. Since you have very few books on the Kindle, it won't be a big deal for you.
It could be indexing. On the home screen, type some gibberish as if you were searching. If anything comes up, you have one or more books that isn't indexed. Remove the book, and the problem should be solved, and then you can download the book again.
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