Sortable tables does not preserve ordering if there are same values

In "All" view, suppose Jenkins has sevral jobs whose status icon color is same.
Click "Name" column header once or twice to make jobs be sorted in ascending.
Click "S" column header once, job name will remain sorted in ascending.
Click "S" column header again, job name will be sorted in descending (Expected: ascending).

You can try it in http://ci.jenkins-ci.org/view/All/