Northrop Grumman interview questions

The initial interview was with a recruiter which went well. I was told I would move on, then received a rejection email. I followed up, had my second interview, went really well and then spent 2.5 months following up to no info. Lastly, they returned saying they were interested in a third interview and then I received a rejection email before the interview.

Was a quick 15-20 minute call discussing my background and technical expertise. Video call was with four other people and not alot of conversation was reciprocated by the interviewers. Felt like I was just talking to myself for 20 minutes. I was in a pretty care free mood and did not really care if I landed the job because I thought it was going to be a very competitive position. They offered the job the next day.