Filed my Jan 16th accepted Jan 27th. still processing. They say my irs account is under my remarried name. I divorced 12 years ago Changed name w/ss and DMV. How?

How did this happen. I been back at my maiden name for 12 years now?  No issues b4 with taxes. I have an appointment with TAC thursday to figure it out and fix it. Just want to know how this can be and will it really take 9 weeks for my return now?