Some weird stuff going on with the bump, here. The board has a bump texture driven with the brick texture at a straight forward black mortar, white bricks, but the tiles are all over the place, with some weird shadowing around the edges of each tile.
I was just playing and didn’t save the blend. Even so, the tiles should be raised, and the mortar depressed. Ideas?
EDIT: And don’t get me started on the white hints on the shadow catcher.