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Hmm, it seems strange that your books would redownload on their own (I'll see about looking into that), but let me explain the deal with auto-deletion and that setting:
The app's 'permanently store' setting (which actually has all, 5, 1, and 0 options) doesn't affect what books are downloaded, just where they are saved to. Apple's change required us to start storing books in a cache folder -- this setting determines how many books we store elsewhere. Regardless of your storage setting, the app will always only automatically download your latest 5 books.
The problem with storing books in a cache folder is that the system can now clear it out at any time — it's still unclear what exactly can trigger this, but the device running low on storage is one scenario. Books (or any data) stored outside of the cache folder are not deleted automatically.
My recommendation would be to leave the setting set to permanently store all books, and if you're concerned about storage space I would tap on any not-yet-downloaded books that you don't want around to leave them in a paused state. They should never automatically start downloading once they're paused.
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