Cat-like scratches on my white Phalaenopsis orchid

[Esther123]

Help please. This is my first orchid. Was given to me last year with beautiful white flowers. I watered once a week and all was well. A few months ago, I saw that the roots were turning brown and soft so I followed a YouTube instruction and replanted it in a plastic pot with rePotme brand - Phalaenopsis Monterrey Dark Imperial Orchid Mix.
Then the scratches started to appear. (I have no cat, btw) .
the scratches are increasing.

I have not fertilized my plant so far.
There is no fungus that I can see.
I dry well at the root of the leaves after watering
The roots are green and stiff
Leaves are ok except for one that looks a bit wrinkly and soft
I soak the pot in water once a week and drain well.
Most of the roots are on the top outside.
The scratches are dry and cream color

I will be so grateful if someone could tell me what is causing these scratches.