Mouse scroll gone ballistic, uhk60v2

I have a setup where I use a usb splitter for mouse/keyboard to switch between my mac and my pc. Now, suddenly, when switching back to mac this happens:
Mouse scrolling, that normally scrolls a few lines, now scrolls like 1000+ lines.
Unplugging the keyboard and back again makes the scrolling go back to normal.
I have mapped mouse scroll as mouse Y, H on my 60v2. Mouse scroll speed is set to low values (about 10 pulses).
It may be that this started happening after last firmware update, 12.2.0.
Any ideas anyone?

So you can reproduce the issue every time, right?

If you look up uhks properties when this is happening, do you see high res scrolling enabled or disabled?

When you switch yet again to pc, does it return to normal and does the pc see high res scrolling on or off?

Hmm, where do I find the “uhk properties”? In hwsettings windows? macos? Or in agent?

In your OS. On linux I would fire the terminal and start with lsusb. On windows and macos, I have no idea.

I can give you this as a starter for further research: ChatGPT - USB Device Properties Check