Just for the record, the most common reason I have seen for this problem is multiple authors. The Kobo firmware doesn't handle the way calibre puts multiple authors into the books properly. Calibre correctly puts the authors in as one entry per author, but Kobo is only reading the first.
The series info is the next reason. Add in articles being put at the end of titles and series, and I'm always a little surprised that anything matches.
A little while ago, Kovid added a function to allow you to fix this. When on the device list, right click on an unmatched book and select "Match book to library". The dialog lets you search for the book in the calibre library to match the book on the device. Once you have found it, select the book in the list and press OK. Once you have matched all the books you need to, right-click on the device icon and select "Update cached metadata on device". This adds the match to the file on the device that calibre uses for matching all the books.
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