In order to help you better understand the scheduling/descheduling circumstances I am passing along this portion of a recent email I received:
Mr. __________ and Ms. ____________ (DHS/USCIS Raleigh District Office) have asked me to pass along this information to all of the chapter members concerning descheduled appointments. There was a clerical error which resulted in sending out interview notices which should not have been sent. For that reason, notices are being sent to deschedule appointments for N-400s during October and notices are also being sent for 11:00 a.m. appointments for I-485s during October. The only reason these appointments are being descheduled is because of a clerical error and Mr. _________ indicated that he hopes to reschedule them by November. He was unhappy that these notices got sent out before he caught the clerical error and he apologizes for not having caught it earlier.