I have a problem with our new bathroom floor tile. The tile is white ceramic tile with a black band around the perimeter of the room, and the grout is white as well. The only problem is that the colour of the grout is not uniform. Parts are white and other parts more a beige. It appears dirty and I don't like it. I am getting the tiler in to look at it. Any ideas what is wrong?Before getting in touch with him, we washed and then sealed the grout. Oh Oh. Are we in trouble?