That looks like it’s viewing through window glass? If so it could be natural reflection on the glass that especially happens when the camera is at an angle to the glass and can be in only a portion of the image like you’ve shown.
You can check by turning it to inside the room and seeing if it goes away. If there is no window, then it might be the camera. There is a little clear filter inside the camera that some of us found was dirty with some sort of film on it. Check this thread if you think it’s the camera and it’s not under warranty:
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