This is happening to me and at least one other user on a Facebook HX Stomp XL group.
I notice that if I press and hold either switch, it will go the direction I set it to (up to 2, or down to 4), BUT when I release the switch, it jumps another snapshot, landing me on number 3. When set to "preset up/down" or "bank up/down" they work exactly as they should.
Even setting them as stomp 7/8 and use them as bypass switches, they work, although trying to set anything to Stomp 8 as a bypass switch freezes the XL and it is unresponsive. here's a vid of it. I'm using the Ampero Switch
Toying around with it, I managed to use command center to make Stomp 7/8 work as Prev/Next Snapshot, but even then it was janky and not working all the time.
here's video of me showing the skips and the unexpected freeze as described
