audiobooks not loading correctly to iPhone

My Harry Potter books are in order on my Mac Book. When I download to my iPhone they are no longer in order. I can search for the book and it will come up but the disc order is all jumbled up. Originally I burned the books from cd onto my computer. How do I get them in order on my iPhone?

It's very frustrating that they are in order by title of the book on my mac book and my iPad but NOT on my iPhone.