I have faced similar issues Cluster Admin Series courses ADM203 etc..but was somehow able to fix it by working on courses in Incognito after a few tries. But here a strange situation with HBase Developer Series DEV 320 Lession 1
As you can notice it shows Q1 -L2 - Q2 - L3 - Q3 as complete but Lesson is not complete. The only reason could be that i failed a sample question in lesson after two tries and after revisiting again i cannot answer that question again.
Need help in marking this course complete.