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Altitude increase.

I appreciate your patience with my computer skills.

I think you have some significant IMU problems. If you look at the two IMUs, and integrate their calculated vertical velocities with respect to time, and then compare those with their recorded barometric height and the actual GPS height, there are significant disagreements:

dat_height.png

GPS and the IMU_1 barometric height sees the uncommanded climb. The other IMU data appear to be garbage. You could try an IMU calibration but otherwise this probably needs to be replaced.
 
was imu re-calibrated? i mean, it looks a bit similar to a situation when accelerometer is not working correctly. is it reproducible after imu recalibration?
 

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