Hi Celine, thanks for getting in touch! When you click on the progress pie at the top right corner of the page, which activity does it point you to? It's likely the video, whereby you will need to watch it to the end in order to get the progress tracked for it.
If you are still having problems, kindly email us at firstname.lastname@example.org with the screenshot of the activity that the progress pie points you to and we'll investigate this further. Thank you!