Font misaligns after using a custom default resolution font

After making edits to the /font/default.png in the minecraft.jar (not a texture pack),using the custom font, then changing to a texture pack with the normal /font/default.png, the letters in the GUI will me misaligned.

To reproduce:
1.Make edits to the alphabet in a copy of default.png (not size or shape)
2.Put the edited .png into /font
3.Use the default textures, then change to a texture pack with the normal /font/default.png
4.Look at the GUI (Item names, menus, achievements, etc. Note that chat appears normal.)
Note: Edits of the .png are counted as modding in this report. No files other than /font/default.png were changed. I am also using the old launcher, because the custom font doesn't appear on the 1.5.2 with the new launcher.