We’re continually adding new and updated course materials into MatadorU. Any time you notice that your completion percentage has dropped, it’s likely because we’ve updated the course materials for that chapter. This doesn’t affect your course completion, as once you’ve submitted an assignment or exercise, we consider your work on that chapter to be complete.
However, if you’d like to bring your completion percentage back up to 100% and keep up with any new additions to your MatadorU course material, simply open up the chapter and locate any unread pages by looking at the page numbers at the bottom of the screen. Completed pages will show up highlighted in green.
There’s no need for you to re-submit the chapter’s assignment or exercise.