Phantom presence behind switch, how is this possible?

Hey everyone, finally bit the bullet and switched over to Z2M and installed the visualizer addon. Wow, what a difference over ZHA lol.

Mostly all good things but somehow, I’m getting phantom readings behind my switch. I’m not really sure how this could be happening. For reference, my single zone is measured using a laser and I’m intentionally setting it inside the room by 5cm in each direction to avoid catching the walls. There is nothing there that I can think of and the left side in the picture is the exterior of the house on the second floor. Any ideas?