Orange Mesh in Lighting Only mode (after building)

Anyone know whats causing this weird issue?
This screen is the Lighting Only Mode, so that we can see the Orange color in the Mesh.

In the Lit Mode, the same orange mesh looks very bright.
This behavior started today. This is the first time that I see this in Unreal, and I dont have any clue whats it.

This appears after Building Lighting. In my scene I have only static lights and a SkyLight for the exterior.