Some hidden hex characters in your source code cause this issue. In IE non-breaking-space-characters are not stretched in justified text.
The Developer Tools in Chrome reveal the HTML code which these characters generate:
A hex editor (HxD in my case) lifts the lid on some hidden characters in your source code (00
and 20
are OK, but a A0
renders a
, which causes the problems in your case):
You could try to copy/paste your code using a text editor like notepad++ to get rid of these characters. Using Dreamweaver, which has has a built-in-feature to show hidden characters (view > code view options > hidden characters), everything worked fine in IE after deleting these characters.