Since a couple of releases the sortable.js script seems not to work with the sortbottom class anymore. Im not sure if this is the problematic commit:
https://github.com/jenkinsci/jenkins/commit/c73b4ae92f1bb5e8f74649c3d642ad6030c54e69#commitcomment-1251804

On the following pages you will see the bug:

• http://faktorzehn.org:8081/view/Jenkins/
• http://faktorzehn.org:8081/view/Jenkins/job/Jenkins%20Analysis%20Plug-ins/602/findbugsResult/
  Most number tables with a totals bottom row are affected. When you click on the sortable header, then the bottom row will be moved to the top.