Is the lecture of the angle of attack really working?

I´m doing a plane simulation and while runing ArduPilot the AOA that appears on the graphs of mavproxy doesn´t seem to have any sense.
If I do calculations using the Lift coefficients of the SIM_Plane and de AOA it results in huge Lifts that are impossible and that don´t feet with the dinamics ecuacions of the flight.

Is the AOA working correctly? Does the AOA from ArduPilot graphs corresponds with the AOA of the simulator? Am I doing something wrong ??