Maps from one world copied to another world and more.

What I expected:
When I looked at a newly created map, I expected to see the area I was standing in.

Instead I got the map that I had created in the last seed I explored.

Steps to recreate:
1. In creative I got a new map and paper, wrapped the map 4 times with paper to zoom way out. then flew over the entire area to render the map. This map/seed was originally generated with an earlier snapshot (not sure which one)

2. I created a new random seed in 13w38c. Again in creative, I repeated the steps above to create a map zoomed out 4 levels. When I looked at the map, it was the fully explored map from the previous seed. Flying around did not update the map.

3. I tried creating additional maps adter that. One rendered, one did not (completely blank), one seemed to lock up 1/2 way through rendering.