Question orbiter:map display flight trajectory problem

[xjflcf520]

When I tested whether the map that comes with the software can display the flight trajectory, I found that sometimes the trajectory can be displayed correctly. When the aircraft has been hovering, the starting trajectory display is correct, but the middle trajectory becomes Straight line, the trajectory is displayed as shown below，I don’t know how to set it up to make the orbiter:map display my true track correctly throughout the entire process。

 

[xjflcf520]

And there is still a question why the previous trajectory is slowly disappearing when the flight trajectory is relatively long. What is the reason for this and how to solve it?