If the drone didn't descend to the right height when arriving at the first point of the polygon, and the sample image you received is higher than should, here's how to fix it:
1. Press the play button and start the mission.
2. In some cases, the drone will descend to the right height after the mission starts.
If the drone still flies in the wrong height, press the pause button:
After pressing the pause button, the drone will hover in place and you will gain manual control.
Take the left stick of the controller down, and descend the drone to the right height.
Use the VPS height value that is shown at the button part of the app to see the actual height of the drone while descending it:
After the drone is at the correct height, resume the mission by pressing the play button.
The drone should now fly the mission at the correct height.