Video controls not showing up on iPad


I have created a course and published it to html5 (not the Articulate player).  When testing on the iPad, 2 of the videos work - they actually autoplay with no video controls.  On the videos where I have included the controls, the controls are not visible on the iPad, and the video does not start.  They are visible in a desktop browser.  I have tried to remove the controls, but the videos don't play.  I am stuck.  I have tested in both Safari and Chrome on the iPad, same result.  

Any help would be greatly appreciated. 

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