Thrust and torque setpoint control

“The drone’s offboard mode is set to actuator=true.”,At the same time, the DDS topic has been correctly added and recognized,i try to run my code gazebo-classic"I found that when I was using thrust and torque for control, I set the thrust to [0, 0, -0.52] and torque = [0, 0, 0]. In the Gazebo simulation, after takeoff, the drone experiences a downward pitch, and after flying for a certain distance, the pitch suddenly increases dramatically until the drone flips. I would be very grateful if I could receive your help."