Did I mess up my new KoMo?

Hey all !

So I am venturing into the world of home milling, having recently purchased a KoMo Classic. So far it's been a great mill, though I am curious to see if anyone has encountered the issue into which I've recently bumped.

I may have brought the stones too close together for a grind, as when I took off the hopper to clean it out a little bit, I noticed that the millstones showed signs of wearing. In effect, they are almost smooth at certain points, as though they have ground each other down. I am curious to learn if this is just normal wear and tear, or if I have royally screwed up and need to get new stones!

Thanks for any and all input