Mouse X and Y are way off.

Newbie & Debugging Questions
#1

Here is my code:


        public static Rectangle rect = new Rectangle(Mouse.getX(), Display.getHeight() - Mouse.getY() - 1, 1, 1);
	
	public static void update(Input input) {
		rect.setX(Mouse.getX());
		rect.setY(Display.getHeight() - Mouse.getY() - 1);
	}

It then says that the mouses x and y are about 500 pixels away on the X coord from the mouse cursor. Whats the whole reason for this?