I am sure it is a mistake. Since my status also changed to 30 to 90 days, I thought it might be for people with old RD/ND (my RD 03/02). Then I checked an I-485 with RD 03/03, and it has the same message which is almost impossible. So I concluded that there must be something wrong. Keep your heads cool and hang on there guys. Every dog will have his day!