I was thinking that might be the case, thats why I mentioned the Windows key + shift key + > key keyboard shortcut for moving a window from one monitor to the other. Only problem is I got it wrong, its Windows key + shift key + arrow key. ops,
If you go back to that screen in the tutorial where it shows your two monitors, you can reverse them just by dragging one to the other side so they match how you actually have them positioned. It may make things easier.