I reported it. What is a "seller"? I would never say that in English without specifying what kind of "seller", and even then, I'd probably say shop attendant, store attendant, sales attandant, sales clerk etc, or just "guy/girl/woman/man/dude (who works) in the shop".
"The sales clerk is not tall, but rather short." was also accepted as correct. I think that "salesman", "saleswoman", "sales attendent" and "sales assistant" should also be added as correct alternatives. I don't know how many alternatives that they have space for though.