Audition saving multiple versions of file

Hi all,

I'm relatively new to Audition (a print journalist who has moved into radio work) and I'm cutting up some interviews for the sound designer on a radio documentary I'm working on. 

For some reason, Audition seems to keep saving new versions of a file as I'm working on it and making/saving changes. See pic attached. I did not create/name these files, just the original. Whether I'm saving or it's auto-saving, it creates a new file and adds the latest number at the end. Is there any way to stop this? I have updated to the lastest version. Perhaps there is a simple fix but I have not found it through searching the most obvious terms. 

Thanks,

Lenny