why is my phone adding random songs to my favorites playlist

Ever since the addition of being able to favorite a song, I have had no issues with the concept except that it is adding random songs from my library to my favorites. Like most other posts about this update, I could live without the new feature and in particular I would prefer it if the feature is not going to work the way it should. What’s the point of favoriting songs if they just get mixed in with ones I do not want favorited. I’m curious is anyone else having this issue? And I already did research and some people said the problem was someone is downloading songs in my family and they are getting put into my phone but these songs are all songs I already have saved and I never had an issue with it before so I don’t think that’s quite the case here.