There may be a problem with indexing. Search for a nonsense word (for example, fghsthn) on the homepage; you should see whether there are any unindexed books in the results. If there are, leave your Kindle connected to a charger until all the books have been indexed; if after 24 hours there are still unindexed books, delete them and add them again one by one (wait until the previous book has been indexed before adding the next one).
If there are no unindexed books on the Kindle, try connect to wifi and see if this helps.
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