Grey ring around my mixing bowl

Toast
Stain on the bowl

Hello! I wanted to ask if this stain on my bowl is normal or not? I bought this mixer a week ago and I’ve used the bread hook twice and the whisks once. I’m not sure if it’s normal wear and tear or if I did something. Do I just need to scrub harder maybe? 

First - remove the coloration - see if it comes back. If it does - and it may take a few tries - it's part of the bowl. If it does not impact flavor - it is fine. If it does - contact the maker and ask about it. Enjoy!