This is totally normal - and it's called "mirroring" by psychologists. It is not a problem at all. It is used by 'normals' to show the other person that they are listening and empathize.
What is interesting to me is that not only I, but the rest of you as well, also mirror others' behavior. I have thought it odd that, given my AS, that I would not be able to mirror, when in fact I find myself doing it. And you all do it too - this is a good sign I think.