In Reader view(safari), the doc for classes is not correct

I am on Mac 10.10 with Safari 8.0, and the Reader view could be triggered via Cmd+Shift+R

When trying old doc, like http://qt-project.org/doc/qt-5/qobject.html , the doc in Reader view is correct.

But when try new one, like http://doc.qt.io/snapshots/qt5-5.4/qobject.html , the doc in Reader view in wrong, only displayed "Inherited By:" part.