Could it be the material shininess? The ship material seems to be too reflective. Look at the white part at the ship's rear left corner. It's reflecting the illuminated zone of the floor. Look at the floor below the table and chairs too. It's reflecting the leg of the chairs.
I think that's the cause of the color change. Try to adjust the shininess on the material and it should help.
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If a long walk every day were healthy, mailmen would be immortal.
