One thing I learned at Amazon, data quality is a huge problem for any media information. It wouldn't surprise me if this specific instance was just a missing field somewhere which you could use to "fingerprint" the data source (or more correctly, one of the data sources, because aggregation is the next huge problem in media data). Often these data sources are in truly awful formats as well, with special problems when it comes to eg. Unicode names.
The popular stuff gets fixed quickly, everything else gets to rot until someone with the right mindset and interest goes and fixes it. The bet with a lot of sites that take corrections is on whether there are enough people who care to make a difference.