Is there a magenta warning in the joystick settings screen? Both of these devices come with default configuration files, each of which is set up to use roll, pitch, etc. If you have both plugged in at the same time, and did not change the default axes set up, X-Plane won't know which device to use for roll, pitch, etc. This can show up as no response in the aircraft, or sometimes the axis will "jump" around. You'll need to unplug one, or change any duplicate axis assignments.