Why does Enum.KeyCode.Up and Enum.KeyCode.Down not work with ContextActionService?

Using contextactionservice and for some reason

cas = game.ContextActionService

cas:BindAction("DownGo", GoDown, false, Enum.KeyCode.Down)
cas:BindAction("RotateGo", GoRotate, false, Enum.KeyCode.Up)

Doesn't work while

cas:BindAction("DownGo", GoDown, false, Enum.KeyCode.Q)
cas:BindAction("RotateGo", GoRotate, false, Enum.KeyCode.E)

and

cas:BindAction("DownGo", GoDown, false, Enum.KeyCode.Left)
cas:BindAction("RotateGo", GoRotate, false, Enum.KeyCode.Right)

Does work.

Why?