Rise -next lesson not working

I recently shared a SCORM Rise course with another team who uses i-Learn (Telus administered) system. The course works fine on our LMS (Moodle) but the navigation is a bit wonky on the other system.  As per the attached image,  when you scroll up, the previous lesson is on the top of the page with an arrow up. 




But when you scroll down, there is no lesson 4. 

Has anyone ever seen this before? Better yet, have you ever resolved it before?!


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