Changeset (side-by-side) Diff is confusing

Changeset: https://extranet.atlassian.com/crucible/changelog/FE-hg?cs=886678a112530c646d40428d7fa5b40b976447af Shows this diff:

When you have side-by-side diff turned on here: https://extranet.atlassian.com/crucible/browse/FE-hg/src/java/com/atlassian/fisheye/git/client/GitChangeParser.java?ignore=n&r1=3be6b367396b497842cbe6fe33711664ffc79e8a&r2=886678a112530c646d40428d7fa5b40b976447af
(which actually shows the diff correctly in both modes)

When you change to Unified:

You get the correct diff back on the changeset page:

EDIT:
So the changeset page is actually in side-by-side mode, but this was totally non-obvious and there is no way on the CS page to change to unified!