Edition audition files play as mono in finder

I discovered a very strange thing when editing my files in audition. If I change and save the file in audition, it plays as a mono file in the finder. When I open it again in Audition it is stereo. Other files that I did not edit in Audition, play stereo in the finder. It may not matter, but it is strange and somewhat disconcerting. Has anyone else experienced this? I am concerned the file may play mono in some other programs. Should I be concerned?