Last modified: 2008-10-23 23:30:32 UTC
When viewing diffing deleted revisions, the ids mw-diff-otitle1, mw-diff-otitle2 and mw-diff-otitle3 are used on both diff columns. mw-diff-ntitle1, mw-diff-ntitle2 and mw-diff-ntitle3 should be used on the right one instead (note that it does use diff-ntitle).
This was fixed in r42277