The course has built in checks to ensure all elements of the course have been viewed/clicked on.
It's possible you have not unlocked all activities in the course.
You can check on your activities by:
- Selecting the ticks icon at the top right of the course
- Review the modules that need to be completed, these are ones without the green tick
- Go to those incomplete modules and re-review the activities. Try watching the videos and clicking through all the tasks and activities
If you are still having problems please create a support ticket
Click top right of course
Look for any modules without the green/tick