I've found that the Apple Books App will only import one ebook while the app is running. This might explain your problem. The solution is to completely shut down the Books App - don't just click on the 'x' but do that then swipe up from the bottom of the screen when all running apps will be shown in miniature then swipe up on the books app. This closes it completely. When re-opened from the main screen you should be able to import the next ebook without a problem, then repeat for any others. I've no idea why this is necessary - another Apple foible!
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