Odd Image Artifact - Looking for explanation

Image Artifact – Looking for explanations

The photo above was taken with a Wildlife Innovations 12MP trail cam set to 15 second picture interval with 0.5 second trigger. Camera set to "PIR" mode. This is the picture directly off the memory card of the trail camera. I have NOT altered it. Less than 1 minute before and after this picture was a picture of me just walking by the entrance to this barn. There is nothing dangling or hanging in front of the camera lens. Wondering how the white lines in the dark area of this image could have been produced?

Edit: Second Picture added for context. Taken from same vantage point as trail camera with iPhone.