Bit late but I have a solution to this problem.
1. Launch the game on your primary monitor(the one it doesn't scroll down on).
2. Set the game to full screen mode.
3. Press and hold the windows key and shift key on your keyboard, then press left or right arrows on your keyboard(whichever is the direction your second monitor is in relation to your primary monitor)
4. Enjoy playing the game on your second monitor without it scrolling. When you close the game and then re-open it, it will automatically open on the second monitor and not scroll so long as you leave it in full screen mode. If you take it out of full screen mode, it will scroll down again and you'll have to drag it back to the primary monitor and repeat steps 1-3 to fix the issue again.