Some keys not working on USB keyboard (Microsoft Sculpt)

[5321dh]

Hello,

When I use my Microsoft Sculpt ergonomic keyboard, some keys work, and others don't. I'm using Max's key bindings in rules.ts.

For example, on the Microsoft Sculpt, hyper + s + j triggers volume_decrement, but hyper + s + u DOES NOT trigger volume_increment...
hyper + s + u works fine on the Macbook keyboard.

As a test, I mapped hyper + s + y to volume_increment, and that works fine on the Microsoft Sculpt.

Any idea on what is going on or how to troubleshoot this further?

Pressing hyper + s + u on the Microsoft Sculpt keyboard does not trigger any events in Karabiner-EventViewr.

I have attached the Variables and Devices information from my Karabiner-EventViewer

Karabiner_EventViewer_information.txt

Thank you,
Dan