Pratt & Whitney interview questions

In a word, this interview was weird. Here's basically what happened: I submitted two applications, one for position X and one for position Y. I got an email 3-4 weeks later offering me an interview for position Y. I accepted and scheduled. When I logged onto zoom for the interview, my interviewer said, "So, I understand you applied for position X?" I said yes, I applied to X and Y. He told me he was here to interview me for position Z. Now, I never applied for position Z, nor was I told that that was the position I'd be interviewing for. Moreover, the role was completely outside my field. I pressed forward with the interview and answered the (many!) technical questions to the best of my ability, but I was pretty thrown off by the fact that I was interviewing for a role I'd literally never heard of before.