Lighting calculations strange behaviour

Hello, I am noticing several different scenarios where I think calculations are wrong.

Version: 5.12.1.7315

I am working on a parking garage with 3 floors. When I change lights in some floor, it affects lighting calculation of another. Just how is that possible, as I see it, no light can go through any floor to affect the other.

If we look the same floor, when I change some specific light (one luminare) to have less lumen, less power/less lighting, it somehow increases maximum in lighting calculation. That seems impossible.

When I change light in closed room, it affects calculation on the same floor for space outside that room, which is different area of calculation. Another seemingly impossible case.