I have run into this issue as well recently. I right click a clip and choose Edit in Audition, perform my edits and save in Audition (both PP and Audition remain open). Back in PP, I can see the audio clip has changed colors and reflects the new audio clip name, but the volume sounds lower and does not contain the edits I made in Audition.
In CC this seemed to work fine, in CC2014 I am now having this issue.
Does anyone have a suggestion of what I might be able to do to get this to work as intended?