Google play music adding random songs to offline availability

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I have what I believe to be a strange problem but I am hoping I am not the only one with it. When check songs in google play music to make available for offline play the app also adds other random songs to offline availability. To make it even stranger she I go to remove tho songs the offline play pin is NOT checked and when I choose the option to only show offline music the music shows up but is greyed out however it can be played. I went to the google music storage cache and sure enoug the music is there. I thought I would just manually delete it but with useful names like 1034.mp3 it makes it difficult. (the directory is /sdcard/android/data/com.google.android.music/cache/music/ ). Anyone else experiencing a tying similar? I am running CM9 atm but was running CM7 not too long ago with he same problem and had it as well on stock touchwiz.