Garbage CC info being recorded

As you can see, I am getting “garbage” (for lack of a better term) in my CC lanes. This is from moving my kbd controller’s mod wheel. If I move the kbd’s volume slider, the CC data is nice and smooth as it should be. I have no other seq to check this with, but I doubt that Cubase is at fault here. Has anyone ever seen this before? Wondering if I need to swap out my kbd (it’s only about 4 yrs old), or can I swap out just the controller wheel? Even tho the volume slider is ok, is it possible the MIDI cable is at fault? Thoughts?

Thanks in advance.

Looks like the mod wheel pot is dirty.