I'm making a small room and furniture and running into some issues lighting it accurately. Here's the problem simplified:

This wood of this drawer is all the same material, but renders in two completely different colors (the brighter color is the intended one). This happens with spotlights and area lights. The same thing happens in the full room and on higher render settings, so it's not a matter of light bounces.

It happens with other objects, too:

Again, the same material, but rendering differently. Oddly, rotating either of these props 90 degrees doesn't change which faces are brighter.