Understood we are seeing 13 billion year old light.<quoted text>
The galaxies we see now are farther away now than they were when they emitted the light we see. Right now, they would be about 45 billion light years away, but we cannot see them *right now* because it would take light time to get to us. We see them at 13 billion light years away because that is how far the light had to travel to catch up to us.
But there is another factor it isn't the distance at the time the light was emitted.
MACS0647-JD is thought to be the farthest thing we have seen, we see it as it was 13.3 billion years ago. But it wasn't 13.3 billion ly away when it's light left it, it was closer. The light traveled father than the actual distance was between us when it left, and now it should be nearly 46 billion ly away.