Hi,

as Joe writes, that is NOT how it is supposed to sound.
The only time I’ve heard something similar is when there is something wrong in the mapping, like triggering one or several articulations instead of HatsTrig and then moving the modwheel or HH controller, alternatively sending conflicting CC data; like using a HH controller to open while at the same time a keyboard is sending a closed CC value.
I had a keyboard once that caused me a lot of trouble since the mod and pitch wheels were broken so they constantly sent small changes in pitch and mod.

Best Regards,
John