weird lighting behaviour who might be due to the landscape

I have a very weird problem, my landscape seem to reflect his color on a separate room, this room is a big brush and should not have any lighting contact with the landscape, here is a picture so you can undestand better. My Lifgting inside is white so I have no Idea why there is this red tint other than the landscape reflection and I have no Idea why it is happening. Btwe I have no lightint error, just some lighting related to overlaping UV

Thanks in advance