English,
Are you looking at the document expiration on the front of the ticket or the privilege expiration on the back? In June, I had my certificate numbers changed to remove my SS# from them. My CFI ticket was renewable in July of this year. When I got the new CFI ticket, the front had an expiration sometime in the future (can't remember how far out), but the back did have July 31, 2002 specifically listed as the expiration of privileges.
Check to make sure yours isn't the same.