For a week or so, I have had this problem (on Android).
1: giani sicari (artist I have never heard of) plays one album, starts playing by itself, owerwrites my "orders" and the like. Its the same artist and one album all the time which makes it seem weird if it was someone else playing on my account.
2: when I manage to play my own playlists, the track I choose only play a couple of seconds, then it goes down the que, plays a couple of seconds on the next track, then changed again and so forth.
I have logged out everywere, I changed password and I reinstalled the app?