track edit(volume knob)

i'm sorry I don't know how to recreate this at the moment, but i was on the track edit screen and had four tracks. when I reduced the volume of track one via qlink or the main knob it reduced the volume of the second track, when I reduced the volume of the second track it reduced the volume of the third and the same with the third and fourth.... is this a common bug or am I facing hardware failure ?

by the way this is on an mpc one if that matters..... just thought I would add that.

UPDATE ****** I reset prefrences like I had saw on other posts and it seemed to fix this problem if you come across this reset prefrences