Probably just an error on their part. Nothing to worry about. You should however make sure the A number is the same on both. If the A number is different you should call the 1 800# or mail a letter and copy of both letters to the USCIS.
Not a problem. I had a client that got 5 welcome letters! We joked that if they were to send one more maybe they'd just make him a citizen!!
Now, if they send you 2 cards, make an InfoPass appointment.
FORMER IMMIGRATION LAW PROFESSOR -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.
It is probably a mistake.
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