Many websites, including broker websites, feed directly to Trulia and that's how Trulia obtains the information it supplies. Perhaps your home is still showing active on one of these other sites and that is why Trulia is still posting the house as for sale. Click on the view details of the listing and see where that takes you. If it takes you to the original listing agent's site, contact them to ask if they are still feeding Trulia this live data and you can also click on the tab to report an error to Trulia about the listing and you can tell them that it has been sold but most likely the direct feed they are receiving will need to be updated as well.
Good luck and sorry for your frustration.
Gina Chirico, Sales Associate
Prudential NJ Properties
973-992-6363 ext 116