There could be a lot of factors causing the aircraft to respond strangely. Attaching a copy of the log.txt from the X-Plane root folder would probably be the best first step towards troubleshooting. It will have info on your system specs, any device calibration, etc.
Find the X-Plane root folder from Steam by:
Start STEAM. Goto LIBRARY.
Right click on your X-Plane
Choose Properties.
In the rising window choose LOCAL FILES.
And than choose BROWSE LOCAL FILES.
Now you are in the X-Plane Main (Root) Folder and you see the path in your file explorer.