Propulsion Controls Engineering interview questions

PCE called me a day after I applied online, and I had the interview the following week. The interviewer was very nice and the interview was friendly-like. And at the end of the interview, they showed me inside the warehouse where I would be working. However, when I made a courtesy call to the person who interviewed me after the interview. They were nice in picking up the phone, and then their tone got rude on me. I hope this is not how it is working for them.

My interview, was more of just showing me around the shop, a conversation and when can you start? This wasn't a bad thing, my resume spoke for itself, and the superviser knows what he's doing.