I'm currently working with BiaB v2017, but I presume v2019 is the same.

So I'm working on a tune of mine that has 5 RealTracks, when suddenly I notice that three of the RealTracks have been replaced by these Orange colored instruments, labeled Artist 1, Artist 2, and Artist 3. What? I try another style, wondering what's happened to the one I was using, and same thing with another style I try. And another. Either 2 or 3 of the RealTracks have been replaced by these Artist tracks. Now I notice that, when I click on the track info, and when asked about RealTracks that it reveals the original RealTrack numbers. And they sound the same. Well, that's a relief. But why these new Artist tracks at all? I try a seach through Help, but I couldn't find anything related to this.

As long as these tracks don't affect my mix, I don't care what they call themselves, but I am curious about this.