Why isn't my library alphabetized correctly?

So I have a lot of movie soundracks in my library, including all the Harry Potters and Lord of the Rings. It always annoyed me how when I sorted my music by album, they were always out of order, so I added the numbers 1-8 after each "Harry Potter" (Ex. Harry Potter 1 and the Sorcerer's Stone) and 1-3 after each "Lord of the Rings," but apparently iTunes is incapable of counting. Everything's right except for HP2 which insists on being last in the series and LotR3 which insists on being first. I've tried changing it to letters, adding parenthesis, roman numerals, and adding the word 'part' before the numbers, but nothing works. Why doesn't it work? Btw, I downloaded all of these from CDs, none were bought in the iTunes store.