The Last updated field on projects is set by ECA on save of a Task.
I can bulk re-save with the regular content admin listing, but it's a hassle when there's more than one page.
I think VBO can select all across pages.
Drush has a command for saving all entities of a type.
drush esav.
If I don't do anything, they will get reordered as I update tasks.
Project
Modules
Task type
Topics