Joystick input is being constrained to quadrant IV on its input axis

I'm using a Thrustmaster USB Flight Controller for input, and it gives extraneous input unless the joystick is pointing towards quadrant IV of it's axes, in which case it has a full range of motion, where the center of the quadrant is (0, 0), and the four edges correspond to the four directions (x=0 becomes x=-1, x=1 stays the same, y=0 becomes y=1, and y=-1 stays the same). When the controller is pointing in any other direction, it only gives -1 or 1 for numbers, both on GetAxis() and GetAxisRaw(). Is there a way to fix this within unity, or is it a problem with the controller itself?