There could be many reasons a home is still showing up as active. First if you could share where you saw this listing that could help. Was it on Realtor.com or here on Trulia? How do you know its under contract.
Many times when a Realtor doesn't mark the home as being under contract in the MLS, it will still show up on other sites such as Realtor.com. If there are contingencies the Realtor must also note that as well.
Are you working with a Realtor? You could also ask him/her to look into it for you.
As you can see, we woud all love to assist you.
If there is anything that I personally can do for you, please do not hesitate to just ask me.
RE/MAX ACTION REALTY
(215) 669-0589 Direct
(215) 358-1100 Office Ask for Renee