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Please see the official X‑Plane Support page for help.
I am not from Laminar Research; just a flight simmer from down under.
How have you configured your Xbox? Does it have a USB2 connection.? Has it been configured within X-Plane?
If not then you need to do so. Firstly you need to remove all files within the configuration and connection of your xbox to X-Plane. When done have a look at the following link found at https://www.youtube.com/watch?v=hU_TuALAlJk Consider the message and the methodology required. View the video several times to understand the message. Forget about the product be used.
Alternatively consider the manual found at https://x-plane.com/manuals/desktop/#configuringandtuningyourx-planeinstallation or even use Dr Google for a search on "configuring xbox controller within X-Plane" I found many sites on how to do it.
Now if you have configured within X-Plane then I would suggest starting again as I am of the opinion that you have configured two or more buttons or levers to the one assignment or you have configured two or more assignments to a single button or lever.
This site is no longer being actively maintained.