Scratches on solid parquet caused by sanding?

However, you should also free yourself from the idea that as a layperson with a machine, who does this once in a lifetime or every 10 years, you can do it better than the supposed professional. You quickly sanded in a wave landscape that would make the Baltic Sea jealous at wind force 4.

I am not familiar with parquet and parquet renovation. In cars, this is called swirls, car wash scratches, etc. When the paint is then polished, it is removed with an orbital sander. In your case, a rotary sander was apparently used. As I said, I am not familiar, but I would not be satisfied.