Input.GetAxis returns wrong sign only for 1 and -1

Question

I'm using an Xbox 360 controller on Windows 10 with Unity, and the maximum values have the opposite sign as the rest of that side. For example, if I tilt the stick up, I get values from 0.1 to 0.99, but then I get a -1 when the stick is at maximum. Have I configured it to be this way by mistake? I have reproduced the issue in a clean project and using another controller.

void Update () {
    float pitch = Input.GetAxis("Vertical");
    Debug.Log (pitch);
}

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I have discovered that if the axis is inverted (i.e. not as shown in the image) then returned values have expected signs. I will add this workaround as an answer for anyone else who may encounter this problem, but I will refrain from accepting it to allow for answers addressing the root cause.

Answer 1

I had previously discovered a workaround that gave me reasonable behavior but did not reveal the underlying problem. I have revisited the project and have determined the root cause.

Two axes were named "Horizontal".

It seems that the InputManager by default has two axes named "Horizontal" and two axes named "Vertical." Deleting one of the sets completely solved the issue.

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The previous solution:

Setting the axis to inverted causes the returned values to behave in a sensible way. Now if I tilt the stick up, I get values from -0.1 to -0.99 and -1 when the stick is at maximum, and I get values from 0.1 to 0.99 and 1 when I tilt the stick down. I can just as easily write my script expecting an inverted axis, so this allows me to continue. Unfortunately I still don't know what is causing the odd behavior when the axis isn't inverted.

Answer 2

Thank you very much for the solution. In fact, I found double entries in the Input Manager. "Horizontal" and "Vertical" had each 2 entries. I deleted the second entries, they were empty, and the problem was away. It never came back. Before that, I was searching for a couple of days with no positive result. Goto: Unity -> Edit -> Project settings -> Input Manager -> Search for the second entries "Horizontal" and "Vertical" -> Rightclick -> "Delete Array Element" That was all. I couldn't believe it. Thank you, thank you, thank you !!!