Alphabetical problems with composer view in iTunes?

I have mostly classical music in my iTunes library and would find the Composer view function really helpful... but it doesn't work properly.

When I click on a composer within the letter A (Alwyn for example) then it lists all the albums that feature that composer on the right panel - like it should. However, when I carry on and get toward the end of letter B (Britten for example) then it starts to include albums featuring composers who is next alphabetically. And there after the alphabet is messed up.

So when I click on Scarlatti, the only albums I also see albums featuring Schöenberg, etc. Some Scarlatti albums are also on the previous entry (Sawer). What is going on? And how do I fix it??

Many thanks.