Video header fallback image not loading

Hi all, first time posting on the forum.

Looking for some help.

I have set an MP4 as the row background for a site I’m working on and set a fallback image for mobile. However, on visiting the site on multiple browsers on my iPhone, it appears the site is loading the video and then disabling the play button.

I did try and enable video on mobile as an option under the row and it just shows a play button overlying the first frame of the video but that isn’t really the desired result.

Feel free to take a look here: