Either your yoke needs to be first externally calibrated in windows, or – more likely – the yoke does not return to center by itself.
Try these tests and write down the results (yes/no), then afterward we’ll know what to do to fix it:
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While looking at the sensitivity screen, turn your yoke all the way to the left and let it go. Does it go back to the center position in the graph?
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Turn it halfway to the left and let it go. Does it go back to the center position in the graph?
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Turn it all the way to the right and let it go. Does it go back to the center position in the graph?
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Turn it halfway to the right and let it go. Does it go back to the center position in the graph?
If your yoke is older, then you probably answered “no” to most of the questions. In that case, your yoke no longer has the tension necessary to balance left and right and always return back to center when you let it go. You need to increase the dead zone in the sensitivity so that the off-center return positions fall within the dead zone and do not affect the aircraft.
On the other hand, if the spring-back position in all tests (left and right) is always to the same spot (the dot is always the same amount to the left), then you probably just need to calibrate it in Windows. Google Windows joystick calibration for instructions on how to do that.
Hope this helps!