SOLVED: Sample Tank demo riff won't turn off!

I hope I can explain this ok.
I’ve got three songs I’m trying to mix using ST. One worked fine, but the other two, whenever I open ST via one of my midi tracks the ‘right wondow’ riff keep playing. Even if I stop them and move back to CB, when I play play my midi track in playing AND the riff too.

Is there maybe something triggering it?