How did you remove the book? Not same problem, but similar: Yesterday I removed a kfx version (through calibre) and put the kf8 version on Oasis 2. As soon as I disconnect from computer it insists on deleting the kf8 and redownload the kfx.
Only way around it was to "remove from device" from the Kindle itself, then reconnect to computer and let calibre put the kf8 version back.
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