Yes, I can definitely say it was my fault (I filed for my husband with no help from an attorney). There was a line in the application that asked if there was a prior case for I485 filed for the person.
Since my husband had been married before and I was filing for all of the packets, I assumed that he had a prior case for all of them. In actuality, he actually only had a prior I765 and never got the chance to file for I130 or I485. I assumed his exwife did so I stated that the case expired. When the IO saw that, she said that she had to check and see if the case was still in the system.
It's a special case, but I know the case isn't in the system because it was never filed, plus he's been divorced from his ex-wife for 6 years.
Our experience at the Atlanta DO was this:
We came in approximately 30 minutes earlier than our appointment. We went to the window to notify them that we were here for our interview, which, in turn, the receptionist gave us a receipt showing our appointment time. We then went upstairs to the 3rd? floor and waited to be called in. There was only one other couple there waiting to be called in. We were called in about 15 minutes later.
I don't remember the all of the questions asked but she basically went through our package and asked us random questions from the package, confirming everything. She asked why we married so quickly (Married 7/2010, Filed 10/2010 but had been together almost a year before getting married) and said that I just knew he was the one. She also asked what I knew about the immigration process and I said that my family heritage is African so I've always known about the immigration process. Not sure if that was such a good answer.
After the problem with "previous case" was seen, she left the room as if she were going to go check something and then came back and said she needs to check if the previous case was still in the system. She said if we don't hear anything, that we'll receive the card in the mail in 3 - 4 weeks. I asked her how long it would be if we're going to hear something. She said that she had a large case load so just to wait. We were basically out of there in 30 minutes, but I was disappointed that we didn't get our approval that day.