When you DO use the modify ebook function, Calibre automatically adds/modify the Metadata you have in Calibre library, for example, if the publisher book didn't have tags or tags different than the ones you used and you cleaned them and then use Modify ebook, then automatically the tags are updated and you see your tags instead of the originals.
But if you edit the ebook outside of Calibre, you'll see the original information.
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