I created a new project and imported some .mts videos. I dragged on onto the Timeline and it placed the audio portion on Audio 4 track. I pulled another Video .mts file onto the Timeline and it also placed the audio portion on Audio 4 track. Is this a bug or is there some setting that is causing this?
Chances are track 4 is the one that matches your clip's audio type. You can delete any unwanted tracks by right clicking on the track header.
Thank you Jim. Deleting the extra tracks resolved it. I don't know if this problem will reoccur with new projects, but now I know how to fix it.