talk to TAC about this. there is a bug with certain IOS versions where a successful fax is delivered, but an error report is generated and sent back to the sender. This sometimes results in multiple faxes being transmitted to one side or the other.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...