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. 

nav_top

 

 

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

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

Thanks,
Stacey 

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