Automatic Pitch Correction Effect erased everything

Hi everyone,

Sorry if this issue has already been solved but I am kinda new to Adobe Audition and I think I just encountered a bug while using the Automatic Pitch Correction Effect.
Just after I edited a voice recording, I selected one of the clips to correct a small clipping artefact using the Automatic Pitch Correction Effect with a 5px width. After I was happy with my result, I came back on the multitrack panel to listen to my edit one last time before exporting as a wav file.
However, I noticed that my export was empty, and when I came back on my session, it appeared that almost everything in every single ones of my clips had been erased, except a really small frequency band between 18kHz and 20kHz.

Luckily, I was able to find a backup session to recover my work.
Has everyone ever encountered such an issue or has any idea why would that happen ? Is it just a bug or did I do something wrong ? 

Thanks in advance for your help, I hope everything was easy to understand as English is not my native language. 

EDIT : unfortunately, I decided to close and reopen my session to see if it would solve the problem. I therefore lost my session's history and can't see exactly where it went wrong.