I can see the issue. This macro is for creating a standard brick wall, which expects the bricks to be half as deep as they are long. It's the depth of the brick that creates the step at the corners. Because this bricks are very thin (more like cladding) the style doesn't work.
Please find attached a sample file that shows a way this could be done with bricks with any ratio of side lengths.
I hope that helps, please let me know if you have any further questions.