Joystick Input.getaxis incorrect values problem

Thanks in advance for any advice you can provide. I am trying to Set up joystick hardware to work within Unity 4.3.2. Joystick is "Black Widow". Normally under input for Joystick the values obtained from Input.GetAxis ("Horizontal") and Input.GetAxis ("Vertical") should range from -1 to 0 to 1, however the problem is with both axis the default/stationary position starts off as 0, but after moving the joystick in any direction and allowing it to return to central/stationary position it becomes -1 and never resets to 0 again. For example, Input.GetAxis ("Vertical") when the stick is pushed forward it reads 1 then returns to a central position value of -1 with no values displayed inbetween. Pushing the stick backwards/down the values range from -1 to 0 to 1 with everything inbetween. I want value to be -1 when stick is pulled fully back, 0 when central/stationary and 1 when stick is pressed fully forward and everything inbetween. I have attached a screen grab of my input settings.

Thanks again, James.