Next button disappears when published.

Hi Everyone,

I have a weird issue where the next button disappears after I've published and uploaded to our LMS.  Some of microlearnings have this issue and some don't - they seem to disappear randomly.  

Is there a glitch in the system somewhere?  I've even switched browsers to continue building, but it still keeps happening. 

Any insight would be greatly appreciated since we're about to go live with this course.

Thanks,

Jen