It could also be that one book might have caused an indexing problem - once you delete that all the others you added will show up.
For me I had the issue where books just would not appear underneath collections, but they would be there when I sorted by author or title. The Kindle would occasionally hang, and there would be a folder 'Items not yet indexed" when you searched when sorted by title/author.
I narrowed down which one that was by seeing which page it wouldn't load when I sorted by author/title - that way I got the first letter of the title and author.
I deleted that book, and everything was back to normal.
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