I believe this is a bug in the Goodreads plugin. Try disabling it. It seems to not "fail" properly when data does not exist for the book at goodreads, and instead pretends to have found exactly the title/author you were looking for. If there is isbn data, it works fine - fails properly, with an "isbn not found" error. But when just title/author are there, it puts an "empty" entry into the list of results - and when all the other plugins "fail" properly, it ends up as the only result in the list.
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