Noticed a scratch on my carbon steerer, should I be worried? Pictures: https://imgur.com/a/0cWtcsS



My nail gets caught in the center and it feels sort of rough. I had my stem tightened at 4NM and the headset seemed to be properly adjusted. I have once reinstalled the stem; this time, tighenting the top cap a bit more (slightly more than needed to remove play) and setting the stem bolts torque to 5NM.

Any opinions on what this scratch could be from and how can I prevent it?

Really appreciate it, thanks!

Update:

I inspected again and it seems there is another mark from the spacer below. I think the marks may have actually been from the spacers rather than the stem. I thought I had tightened the top cap enough. Here are some pictures. https://imgur.com/a/6nkznf2. It’s very faint but there’s a line below.
Looks like a surface scratch, so no need to worry.

Obvious source of a circumferential scratch on the steerer is the stem being rotated around the it, although in this case I suspect the stem moving up and down slightly from the normal varying forces on the handlebars during riding. Just check for a rough edge inside the stem.