The rubbing marks are seen on the both sides of the prints as the attachment show. The back side is more apparent and some fine debris of the papers are on the black rail inside. I found that the marks are seen on the loaded and unprinted paper.
Also I use both sheet and roll papers, Canson Baryta Prestige and Photographique. The marks are seen on both types of the papers.
I am wondering how I can manage this issue. If someone can help, I would be very appreciative of it.