Not all audio books in a series are grouped

In the series “Dresden Files” all the normal ebooks are properly categorized under the series (20+ books), but the audiobooks only seem to be up to number 4, after they all seem to be added as stand alone books. You can go to the ebook version and it shows the proper audiobook counterpart, but it’s not listed as a series when you view it.

Is there any recourse for this? Can this be reported to Apple or does the publisher need to fix it? One of the benefits to buying books from the Apple store app is you get proper series grouping that can’t be accomplished when adding them manually. It would be nice to get this fixed since it’s essentially just incorrect metadata and makes the library look very disorganized with books 1-4 in a series grouping and books 5-20 being separate entries.