Perhaps it is a font bug that has been a problem in Japan for years?
The fonts for Asia are only outline fonts, and this seems to cause occasional text display problems. The longer you play, the more likely it is to break. The Japanese community has responded by replacing the font with a volunteer-created font. However, changing fonts is difficult for amateurs, so I would like to request official bitmap font support.
Sorry if I didn’t convey my message well since I used a translator.