If it truly is a mistake, then use the contact information given, below, by Patrick.
However, the link you provided is from public records, and shows that 409 Newport closed for $175,000 in March 2004, and the mapping tool shows the house ON Newport Court. Is that when you purchased it and was that the purchase price?
As for 404 Newport CT, Trulia shows public records as well, and the sales price of $215,000 in February 2004, then $225,000 in July 2004. It also say that the "average list price" for similar homes as $210,563. Is that the $210,000 you were speaking of??