canards problem

hi I am maneging to model the flight dynamics of my plane which has canards. 
The only problem now is that, when I move the joystick down the plane pitches up and when I move joystick up then it pitches down.
Does anyone know how to solve this?

The only problem now is that, when I move the joystick down the plane pitches up and when I move joystick up then it pitches down.

Does anyone know how to solve this?