I was having the same issues with my Evo SSD - The one connected with the original Apple cable is the one being recognized ( correct ) the one with the FIXIT cable is not.
In my case, I kept the original hard drive as a backup - what I had to do is use the original cable from apple and connected my Evo ssd with it and use the FIXIT cable with the original Hard drive.
I contacted FIXIT with this issues and have not heard a response yet.
Several other are having the same issues you are having with the EVO ssd