Let me go all SDAI on you...
...and explain that because it was streamed over the Internet, and not broadcast monolithically from a few fixed points, Amazon was able to produce multiple versions of episodes 9 and 10, and show them to different people in different parts of the world. I verified this, of course, by using a VPN service to log in to Netflix from the East Coast and saw the episodes you saw.
This is the future of television, and we're privileged to be here on the front lines right now!