@ericchesek Good thinking, it does appear to be that midi cc message(s).
After extensive testing, I think it may be a bug or at the very least a less than ideal behavior.
I downloaded some of the various Hise instruments that are linked on the main page of the Hise site as well as even bought a couple commercial releases that were made with hise.
It appears that if in the MIX tab <> Auto Select Automation Parameters <> is on, the behavior in the video posted above happens.
If you have that mode unchecked, it does not happen.