There is some abnormal behavior (or normal but not good behavior) when you have the gamepad control the mouse cursor (using set mouse position blueprint node) and press Gamepad bottom face pad.
For some reason, it causes all gamepad inputs to not register for the player pawn and makes the mouse cursor stuck to the game window (when running the game as a separate instance). When running in the viewport, it will not go to the very top of the editor.
Does anyone know the reason as to why this happens and how to fix it?