Vertical ListView in a horizontal GridView

Correct, my experience is different.

As soon as my mouse is hovering over the ListView, it will try to scroll that instead of the GridView.

Let's say I have my mouse in the center of the screen, and I am scrolling horizontally across my GridView, as soon as the mouse is over a ListView, even if it's empty and there's nothing to scroll, my GridView will stop scrolling, it makes for a very bad experience.