So, rather than being an issue with Spotify, it's possible it's an issue downstream? If these artists or labels are using Tunecore or CDBaby, it could be a problem there?
Entirely theory, but if one of these services has been doing any work in the Japanese market, and have **bleep** up their own album/track naming conventions, and Spotify just does as it's told, it could come from there?
As for the issue itself, I've noticed it for months now. As the underlying metadata is the same, it's not affected searches or anything - just looks a bit odd when the track is playing. Particularly on that high quality flagship product, the Xbox player ;-)