I have tracks suddenly playing in my playlists that I did not put there

This has happened more than once now. I’ve been listening to one of my playlists when I notice a change in music genre playing. I check the relevant playlist and find several tracks with blue dots next to them that I did not add to that playlist. It is getting annoying. I highlighted all the tracks and removed them. Listening to the same playlist when again I hear a track I know I did not add. This time, I cannot find the rogue track on the playlist so I have no idea where it is playing from. User control is absolutely diabolic on Deezer. I feel like to returning to Spotify.