I've recently looked at my favorite tracks list, and there are dozens or more songs that I never added to my favorites. They are of completely random genres, not even matching some of the playlists that I have liked ( I thought maybe something was adding songs in favorite playlists to my favorite tracks, but that doesn't even seem to be the case). I have no idea where these tracks came from. Why are random songs appearing in my favorite track list?

Edit: actually it does seem like some of the tracks were from playlists that I had favorited, but not nearly all of them. Some of the tracks were so far out of left field, like the Danny Boy song pictured above, that I have no explanation of where it could have come from.
Even so, did something change where if you favorite a playlist it also adds them as favorite tracks? If so, that's a pretty dumb thing to do. There are some playlists that I like, but I don't want to have all of those tracks added to my favorite tracks as well.