As it stands, all books to which an author is a contributor are counted on their author page under the default Books tab.

Exceptions are when a book is marked as a compilation (this show under the confusingly named "collections") or if the contribution is something other than Author (eg. Narrator). These are counted, but aren't actually listed at all. Meaning that on contributor pages of folks who only narrate books, you'll see blank lists.

I suggest that Author pages have the following tabs: Books, Collections, Contributions, and Series.

Contributions would contain any narrated works, forewords, introductions, illustration/photo, etc. while the Books tab would be strictly the Author's own, primary works.

The result being a much cleaner browsing experience.