I've refreshed the book's rating stats, but I'm still seeing it say that the book has not yet been rated. It might be a caching issue, but at least one of the rated reviews looks like it should be older than the 24-48 hour cache and I believe that the refresh I just did should have forced that to reset anyway. You may need to report this in the feedback group as a bug.
There are multiple correct audiobook editions; it looks like Brilliance Audio probably issued a distinct edition for retail CD, library CD, retail MP3, and library MP3, which you can tell from the distinct ISBNs assigned. That is quite common (in fact, desirable from a cataloging standpoint!) and since the editions are properly combined it wouldn't be causing a problem with the ratings.
There are multiple correct audiobook editions; it looks like Brilliance Audio probably issued a distinct edition for retail CD, library CD, retail MP3, and library MP3, which you can tell from the distinct ISBNs assigned. That is quite common (in fact, desirable from a cataloging standpoint!) and since the editions are properly combined it wouldn't be causing a problem with the ratings.