Here it happens from time to time - mostly when the video card memory has a sort of overrun. My guess. In your case it could be a question of scaling in general as well. I had problems with lights as well when the general scaling of my scenes was too small. Here i see the camera very big compared to the rest of the scene - when i interpretate the screenshot right. Is the camera scaled up here? And if, why? Or are the other objects so tiny compared to the camera. You should try to scale the whole thing up a lot more if that is the case and then see how the lights react to that. Let us know, then we maybe can help a little more.

One day your ship comes in - but you're at the airport.