Japanese Kanji and Chinese character that look similar have the same character code in Unicode.
For example, the character code of "

the character code of "

To correctly display such character in each language appearance, it is necessary to change the font family depending on the language.
For Factorio 0.17.25, I think it uses Chinese fonts even when the language setting is Japanese.
As a result, some Japanese kanji (which can be expressed in Chinese font) are displayed as Chinese character.