Check to see if they are still being indexed. That's the usual cause of such issues.
To check:
1. Go to the library screen.
2. Enter a string of random characters in the search book and tap the search button.
3. When the search results page comes up, if the "Text in Books" tab is active, tap it, and it'll show you how many books are not yet indexed.
Keep your Kindle connected to external power until indexing is complete.
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