Those are valid levels for where the farmland can be placed, not the bricks: "The table above is a side representation of both valid and invalid setups, regarding where you can place your farmland."It very specifically in that link shows that the bricks can be flesh with the multiblock as show in the pic. His bricks are fine. He either is using a bad circuit board or that pipe isnt a wooden conductive pipe.
Those are valid levels for where the farmland can be placed, not the bricks: "The table above is a side representation of both valid and invalid setups, regarding where you can place your farmland."