Complete an Empire or Hutts mission. After loading the quarry and collecting the bounty by shooting the ball onto Boba's ship, if you then successfully shoot the lit target for the Skill Shot too soon, before Boba's ship leaves the table, it will not go to the Sharpshooter Shot gallery.
Again, I don't know if this is only a Windows 8 bug or not. I would be grateful if anyone else can confirm this on another platform.