Troubleshooting a drone in RealFlight Evolution software that circles uncontrollably and doesn't fly properly when connected to Mission Planner

The problem is that when I connect RealFlight Evolution software with Mission Planner, the connection happens smoothly. However, whichever drone is selected in RealFlight starts circling uncontrollably, and even if I arm it in Mission Planner, it does not fly properly. Why is this circling happening, and how can I resolve this issue? im attaching youtube video link please see that issue and help me how to resolve it :

issue video link

NOTE:- drone in the video is custom made drone imported in realflight by me …it flies properly in realflight but it starts circling after connecting with mission planner

(https://youtu.be/AvcheX5FS3k)