Mosaic mishap
Creating mosaics isn’t easy. That’s why they are highly appreciated and rare. It requires special skills and patience, as pretty much any art form does. And it requires a lot of practice. We guess whoever made this mosaic was a beginner.
How else could you explain this misalignment on the bottom part? To makes things even worse, this is a pretty simple pattern. We only hope that their skills will improve over time and that no one actually paid for this.