Matriarch Arpeggiator being odd.

Hi moogies.

I have an issue with my Matriarch, in that the arpeggiator is being funky.

See https://www.dropbox.com/s/cdonsb0o0fqovbt/20210218_205844.mp4?dl=0

Anyone have the same issue? Or know whats the hell that is?
Im running latest firmware, but maybe I need to re-apply it?

Any help would be mega. thanks

Midi loop? Try to reproduce it with USB disconnected.