We've talked for a while now, for a few months. They'll greet me if they see me, and maybe say goodbye to me. This is a common thing for them to do. The first time they did it, I was pretty surprised.
The other day, I said hello to them and they had a surprised look on their face, and then greeted me back. One day, I once said bye to them, and they were surprised but did say goodbye back. We talk every time we see each other. We get on very well.
So why is she surprised that I said hello and goodbye to her? This has happened twice.
Reposting because of confusion in the previous post.