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Or just sort on book title (click the column header) and see if there are two entries for Grailblazers in the gui.
If there is two versions, then you have at some point added a duplicate of an already existing book to your library, and calibre helpfully keeps track of both versions for you.
You will have to handle these duplicates manually, and decide which version of the book to keep or possibly merge formats, and which to delete or archive, possibly by moving the unwanted version to a special library for duplicates. Could be nice to keep in case you discover that you decided to keep the wrong version...
If there is only one Grailblazers book in the gui, and you don't have any books hidden or filtered from the gui view, then a move of the library should get rid of the spurious folders. You may want to examine the books left behind in the old library, to see if you want to keep those versions.
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