Unity 5 mobile single stick control only horizontal movement problem

I currently have a problem related to MobileSingleStickControl.
Moving the Stick upwards or downwards doesnt move the player (character). Moving the Stick to the left or right does move the player sideways.
I allready checked the following:

Am I missing something?
Can someone help me solve the problem?
I did not alter the prefab Scripts except for the Joystick Script because the button snapped allways somewhere else… usually the corner.

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