That is certainly unexpected behavior for that course!
Could I get you to go back to the very first exercise and under Get Help, use the I want to restart this exercise option. That will remove all of your work in the SQL course.
Then, work your way back up to exercise 10. Just before you go "Next" on that one, take another screen shot of the popup list of the Manipulation exercise. I want to see all the check marks in place.
After that carry on and see what happens.