Just a thought, and it may have nothing to do with it - what format are the missing ebooks?
Edit
Another thought that may not be relevant but .... did you buy all the missing books from the same country tht you bought the other ebooks from?
What I'm getting at is, are the books/publishers available in the country that your device is registered in?
If not, then use Calibre to clean, and obok if necessary, then sideload.
Last edited by Lynx-lynx; 04-21-2015 at 07:58 PM.
Reason: add the edit
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