Aftership is a post tracking company, tracking shipments by many carriers. They basically provide a single interface to the gazillion of international carriers and their individual tracking sites.
Do you have the actual FedEx tracking number? Go to fedex.com and enter it there, see what it says. My guess is the Aftership system has read some Fedex message there for your package and "translated" it into a generic Aftership message.
It would not surprise me if there is some forensics software or system that does this...