Thank you for the details!
It seems that while fixing a problem with metadata updating, I broke the test for identical books, with the result that two entries were put into the cache. This regression appeared in the 0.7.2 beta, and will disappear in the official 0.7.2 release.
If you find yourself in the situation where you have two lines for the same book, you can fix it by deleting the .metadata.cache file. You will, of course, pay the scan time penalty on your next connect to calibre, but you won't have doubled books.
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