When this happens to me I can usually fix it be running through the section the the trouble shooting manual bellow
Issues with your progress getting saved:
You finished a course but don’t see check mark next to it when going back to your freeCodeCamp account
Refresh the page to see if that works. A page refresh is required before you see the check mark.
The checkmark still didn’t show up
After the last step of a course, you will see a ‘continue’ button to finish it:
Clicking ‘continue’ is what triggers your progress to get saved. There’s a chance you didn’t click it or something went wrong. Open your finished course back up and it should take you to that screen. Click the continue button again to save your progress to your freeCodeCamp account.
Still no check mark? Recycle the VM
Your user token is used to save your progress. As a security measure, we delete them when you sign out of freeCodeCamp. A new token is created again when you open up one of the projects, but existing VM’s still have the old token until it shuts itself down. Open up a different project to shut down your running VM. Then go open the old project back up; the container should now have your new token. If you finished the project, it should take you right to the screen in the image above. Press that continue button to submit the project again. If this is the issue, it should now be saved and show up the next time you refresh your freeCodeCamp page.