Sections of the code are unreadable in side-by-side diff in IE7

Looking at this diff:
https://extranet.atlassian.com/crucible/browse/FEP/trunk/src/main/resources/atlassian-plugin.xml?r1=150917&r2=152152&%40dm=y

In IE7, there are sections of the code that are underneath other sections, obscuring parts of the source.