Clearly my scans. At least used the scans as provided, in 8K. It can't be a coincidence that the pages also has that crease mark in mine. At least tell me how you edited this, was it pure leveling or did you use topaz clean? This info would help me provide better scans in the future.
The translator just replied that he only used some common apps or software for editing with a few clicks, the translator even did know where the source is from(but as you said there are crease mark in some pages, should be your scan), sorry I cant help....