Northrop Grumman interview questions

I had to complete a phone interview at first, then go to an in-person interview with more technical questions. After that, I waited for about a month before receiving my offer.

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.