Skylight odd lighting

Hello,
Why adding a skylight adds this shade to movable objects? No matter if the skylight is static, stationary, or movable,
Thinking that was a reflection or something like that I placed multiple layers below to avoid any light/ reflection leaking, but nothing seems to matter, apart from removing skylight.

really need help :frowning:

It’s me again, any help? I’m really stuck :,(