Have a look at many record labels, this is a common issue. In the bad old days of MP3 there wasn’t a composer Tag so the record label made Album Artist = “guy playing”, Artist = Composer
It is absolutely widespread, wrong but widespread. DG, Decca, Philips etc are some of the worst offenders.
Roon simply picks up the metadata from a third party (in this case the streaming service) who are in turn suppled by the record label