What happened when you disconnected the device after adding the books? Did the processing screen show? Have you restarted the device since this started to happen?
One of the causes for this can be a problem in one or more of the books. If the processing fails for one, the rest might not get added. If you remove these books, and then add them one at a time, hopefully the ones that aren't causing a problem will be added and you can then try and work out what is wrong with the others.
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