Courses not showing as complete
Usually if you're not seeing a course marked complete (e.g. it shows 5 of 6 complete) even after you've completed each topic, this is a lesson completion error. You'll want to enter the course and click on the lesson itself (without expanding to see the topics) that is showing as incomplete. This should immediately mark your full lesson as complete.
Please submit a ticket if this solution does not solve your problem.