Problem converting DRM free AZW into ePub: Post DRM Removal - htmlz

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I've managed to remove the DRM from a .azw drm ebook (Amazon), but Calibre and all the other tools I've used have turned the .azw file into htmlz/zip (book_nodrm.htmlz, book_SVG.htmlz, book_XML.zip) files. When I try to convert them in caliber into ePub the format is all sorts of screwed up. Is there another tool that I can use that is better for formatting these types? Is there a way to convert .azw and keep the .azw extension without losing quality? Thanks in advance!

You can try to contact the Calibre support so that they can fix the bug.