Certainly no way to know if it might normal, abnormal, and if the latter what it means. There just isn’t enough to go by to provide an informed response. What you described is actually a therapeutic technique introduced by the late Fritz Perls, called “empty chair,” where the person goes back and forth between two chairs talking to a different person, or frequently between different parts of one’s personality. Yes, it’s sort of funny when you imagine people actually doing this, but it’s a way to externalize and act out these parts so they can be understood to get a better handle on internal conflicts.
If you are curious, I would Google “Gestalt therapy, empty chair technique.”
You might get a better perspective about something you do which may be a way of trying to unconsciously figure out some things.