The problem is they’re sorted by artist credit, and artist credits don’t have sortnames.
We could probably sort by a combination of sortnames of all artists in the credit. That would mean the actual credited name is ignored though (so, all releases by “Puff Daddy”, “P. Diddy” and “Diddy” would all sort under “Diddy”). That doesn’t sound good to me (since it wouldn’t sort stuff where I’d expect it), but it might be good for some people.