Ardupilot pose sending problem

Hello all, I am trying to send pose to my drone and navigate it based on an image processing algorithm. However, I faced a problem which can be called as a bug or my ignorance. After landing at the end of my first try, I want to try a new attempt. At this moment, I figured out that the drone set the coordinate system zero. That is not the actual problem. When I try to pose it based on the new coordinate frame, it navigates itself based on the previous coordinate system. I couldn’t give a meaning to this situation. Is it a bug? If so, could you give some ideas to solve it out? Thanks.