I485 has been approved. but no card production ordered

I got letter to tell me that my I485 has been approved. The website information is the same.

But after 1 month, I have not received any information about the card production has been ordered. I just got one letter, one e-mail, no further notice. I am not sure what is wrong with my card. Did the Immigration Officer forgot to order a card for me ?

What should I do ? call USCIS ? or write a letter to USCIS ?

Any one had similar experience ?
THanks.