Official comment
That's not good... Make sure you are not running any other drone related apps in the background. That can interfere with settings. Use the DJI app to check the aircraft out and then FULLY close it.
Change your 'RTH Offset' value to 0 meters in the 'Flight Control' section of the Settings.
Also, make sure you are running the latest version of the app (you are not). You might want to delete the version you have and do a fresh installation while you are at it.