Not all windows/controls support high-resolution scrolling. (In a lot of cases, there's no reason to, as they can only scroll whole lines at a time anyway.)
When you scroll in a control which doesn't support high-resolution scrolling, the mouse/touchpad drivers are supposed to synthesize a normal scroll wheel message.
And while they do usually do that, the problem is they tend to do it in a way that has completely different scroll speeds to the high-resolution messages.
This results in people with those touchpads increasing the scroll amount in Windows (up from the normal 3 lines per wheel click to something much larger) to compensate for slow scrolling in one type of window, but with the side effect that the other type scrolls far too fast.
The post I linked to has examples of this problem in Windows itself. It's not just an Opus issue.