It's not just you. But trying to read everything I can find on the subject, it seems my situation is even more esoteric...
I subscribe to iTunes Match and I listen to music on 3 main "systems":
- Main iTunes library on iMac (ALL files are local)
- MacBook Pro (some files local)
- iPhone 6s Plus (some files local)
The very weird thing is that only the MacBook Pro library is affected by this. I have many "Best of <artist>" playlists. On iMac and iPhone, they are fine, showing only the rated songs. But on the MacBook Pro, they include all songs from an album that contains a rated song. Even if I never added a rating to that song. I understand now this is due to that weird issue where album ratings are sort of reflected in individual songs.
But I find it really weird that this would only affect one of the two "online" libraries. And yes, I am quite glad this hasn't affected (yet!) my main source one. I am thinking of resetting the MacBook Pro library and reconnecting to iTunes match... If I do, I'll report back.