What's causing this light issue?

What is causing my directional light to come through the windows and cut all the way through my project? I’ve tried adding backfaces to my geometry and I’ve tried two sided materials. The image attached is in the basement and should be black. I have no other lighting set up currently in this area. The light on the floor comes from the first floor, on the wall, it comes from the second floor. The light I’m using is a directional light to be used as moonlight(settings aren’t correct, as I’m focusing on this issue first).

have you checked if “Cast Shadow” in the Lightning settings of the ceiling’s mesh is still active?


That did it! Thank you! Sorry I’m just now getting to respond.