Asymmetry and unevenness mean different things to different people in different cultures. I'm no student of Japan, but I think in Japanese culture, evenness and uniformity in tableware, for example, denotes factory made cheapness, whereas in well-made pottery, the variations denote the discipline and artistry. That may be what's going on here, although in a different cultural context. But if you find it disquieting, I'd leave it alone, especially at that price level. Let it speak to someone who responds to that approach.