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i also have a kindle fire HDX but I chose to install a reader app for epub and then use CC to transfer my books as epub.
that bypasses the issue you are having and also stops the bokos covers appearign on the carousel every time you read something. there are many epub reader apps to choose form, some have free trial/demo versions , and the ones no it amazon store can mostly me obtained elsewhere & sideloaded.
meanwhile there is a simple CC tweak to allow your mobi/azw books to appear correctly, just change the default download directory within CC for those formats to "books", instead of "downloads". you can leave it as "downloads" for other formats.
CC will then put your amazon format books into the KF books folder and they will be recognized as books and appear in the KF books tab.
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