Lessons Out of Order

My client changed the order of the lessons on the Edit screen. The lessons are in the correct order there. However, when you go into the course itself on the browser (I went to Safari to view the live site), the lessons are out of order.

Not only that, but at the bottom of the lesson page where it says “Next”, the next lesson is not the lesson it should be.

Thanks in advance!

The page I need help with: [log in to see the link]