If it was a scrivner's error, then a correction deed will only need to be filed. It could be a harmless mistake. However, if it was fraud, then contact a local attorney.
I agree with the above answer. It is not necessarily indicative of any wrongdoing, but you should likely seek the help of an experienced real estate attorney to assist you in correcting this situation. Further, the attorney can help you uncover the existence of any wrongdoing, which could lead to potential legal claims for fraud and slander of title.