midi controller with cubase & vst

I have nanoKontrol2 with Cubase, and I am using vst instruments, mostly the free stuff what I found from internet.
the problem is, that when I do the setup with controller and then moving the knobs - that often it moves the vst-knob as I want BUT ALSO another knob or two of the same instrument! I didn’t choose those by myself, cannot see those linked in controller settings, so I have no idea how to fix this problem. If anyone could help, please let me know.

Thank you!