Map Zooms Incorrectly

Dupe of 64909. Sorry. This is a better description though, so that's useful I guess.

Whenever I expand the map in the past few snapshots, the original map's area is in the top left rather than the middle. In 14w32b, the zoom is a little to the left of the top center, and in earlier versions, it was further left.

Steps to Reproduce:
1. Fill empty map
2. Use multiple of 8 pieces of paper surrounding map on crafting table to expand map
3. Fill new map
4. Notice difference (may need 2 or 3 expansions to tell clearly)

Below is a picture of the bug at work.