Why the status of a completed lessons does not change

[mcortel]

This is happening in French. Many lessons that were completed have to be redone. That I understand. However when I redo the lesson and complete all the exercises till the end (with hearths), the lesson remain in the status of not completed. The number of lessons have increased close to a dozen now. What shall I do to clean this situation and get the lesson in yellow again when it completed? I feel frustrated.