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I am an F1 student and have applied for OPT. The USCIS system today finally showed status as "Card Production" and I got the email for the same as well. However, some time later I received another email saying: "On May 3, 2013, your Alien Registration Number was changed relating to your I765, APPLICATION FOR EMPLOYMENT AUTHORIZATION." The USCIS website still says Card Production. Does it mean that there is some kind of problem with my application?