Did you notice that sometimes white ceilings look gray? Especially in the corners?
If the ceilings were painted in a pure, clean white such as Benjamin Moore Decorators White, that could be the reason. I have learned to never use a pure white on the ceiling because the blue undertone will often appear gray and flat.
Why? Because white has no where to go except to gray when the lighting is dim. And who shines a bright light onto the ceiling? That’s why ceilings can look so dingy even after they are freshly painted. Another clean white paint example is Benjamin Moore’s Pure White.
Just a color tip to consider next time you are choosing a white for your ceiling. Have you ever painted a clean white and thought it looked gray?