Qplane (TriCopter layout) motor response

Mechanically build went fine, however during the first QSTABILIZE flight test i discovered that the motor response on pitch stick inputs was reversed on all motors. Throttle response is correct on all motors, motor response due to aircraft movement in QSTABILIZE correct als well. In FBWA mode elevator response is also correct…please advice.

It’s a VTOL pane (TriCopter frame), forward motors tilting and providing yaw control. Rearward motor is fixed.