Could it be that you flew several grid missions with Pix4Dcapture Android in this area?
Could it be that for each flight the face option of the drone heading was set to face?
On Android for the simple grid mission, the camera can be adjusted to face the center of the grid throughout the flight. All pictures are shot with the drone heading the center of the grid. Note that it only makes a difference if the camera is not nadir, meaning the camera angle is not 90° (vertical).
You could use that option if you, for instance, need to capture information from facades of objects in the area you want to map. Ideally your main point of interest should be in the middle of the grid. It could be a good alternative to circular missions that are not available for DJI drones. We would then suggest to fly low close to the target and to adjust the camera tilt from the settings.
This setting can be accessed from: Home screen > Grid Mission > Settings > Face.