First of all, upgrade to ArduCopter 4.4.4 (or 4.5 hopefully next week).
Second, given the data I think it’s safe to say the drone didn’t expect to be able to climb this fast.
Altitude exceeds target altitude, vertical velocity exceeds vertical target velocity and vertical acceleration exceeds vertical target acceleration.
It becomes even clearer when you plot only the differences and not the absolute values:
Last but not least, with such a big drone you really want to do IMU temp cal and compass motor calibration (MagFit). Consult the methodic tuning guide, especially section 2.1 and section 4 for more info.
