No, it is not. Just remain patient a little longer and you'll get your green card in the mail. If you still cannot remain still for a few days then call the nationwide 800 number.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
You could try the 800-customer service number to inquire (rarely useful), or, better yet, inquire with your local USCIS office about the address discrepancy. Hiring an attorney will help get to the bottom of this quicker and provide some peace of mind.
You are fine just be patient and wait.
Law Offices of Hasbini 619-200.8986. Free on phone and in office consultation. http://www.sandiegoemploymentlawyer.net