Fixed wing landing problem in X-Plane 10

1

Hi!
I try to land to need point in X-Plane 10.
My steps:

  1. Send to PX4 two route points
  2. When second point reached, change PX4 work mode to “Land”
    When plane lands well:
    MAVLINK_MSG_ID_STATUSTEXT: #Landing, heading hold
    MAVLINK_MSG_ID_STATUSTEXT: #Landing, on slope
    MAVLINK_MSG_ID_STATUSTEXT: #Landing, limiting throttle
    MAVLINK_MSG_ID_STATUSTEXT: #Landing, flaring

But sometimes in “Land” mode:
MAVLINK_MSG_ID_STATUSTEXT: #Landing, heading hold
MAVLINK_MSG_ID_STATUSTEXT: #Landing, on slope
and the plane begins to gain altitude.

second route point altitude = 10 m
PX4 firmware: 1.5.5.
What can be wrong?