Horizon flip up to down and in disarm poshold mode AS and ALT changing incrementantly in cycle

I have orange cube installed in hexa with 4.4.1 fimware and only EKF3 with barometer alt is using.
When I flying in POSHOLD mode after land and dissarmed, I immidatelly see in MissionPlanner that horizon flip up to down, EKF vert velocity variance and AS changing incrementantly from 0 to 109 m/s and alt from 0 to 339 meters. Hexa at this moment is disarmed and staying on land.

Whould You Be Good Enough to help me with this?

A set of errors that MP print after disarm and during this strange behaviour:
only after disarmed immidiately this happens

  • EKF primary changed 0(yellow) and horizont flipped

  • error pos vert variance, EKF red and alt -77, -144, -230, also speed m/s 26, 39, 78, 109

  • PreArm: Motor Emergency Stopped -335

  • error pos vert variance, EKF red and alt - 335

    As result when eror pos variance and ekf red on ground in disarmed, speed m/s and alt quckly changed
    speed from 0 to 116 m/s, alt from 0 to 335 and again in cycle

  • PreArm AHRS: EKF3 Roll/Pitch Incremented by 176 and cycling vert speed and alt changing

Also exactly this situation happens 1 time in air.