I have got a problem with my copter in auto missions. Upon reaching the last waypoint when the copter is ready to land it starts to climb up so rapidly instead of lowering the altitude.I can’t figure out the problem. here I will post my two last data flash logs:
Your vibration levels are way to high, it affects EKF vertical velocity calculations.
as Andras said you have vibration problem and in real you vibration in all axis is very very high
as you can see there is a EKF failure because of high vibration and also you have clipping immediately after take off
did you install vibration damper under FC ?