That page is really heavy and thus i can imagine that mobiles have some difficulty with loading that.
I’d try to make it more lightweight and see from there
The first image i looked at, is a 358 kb .png file @ 702 x 1072 px. It’s used on the page at 166 x 254 pixels.
I advise to down sample all images to their used dimensions on the canvas, and then use a compression tool (I use ImageAlpha and ImageOptim)* to further optimize the files.
I ended up with a 64 kb image instead of the 358 kb mentioned here above.
Good luck
* Both for macOS only. Not my company or affiliated.
Okay, after further compression I have got the site size down from 12.6MB to 7.7MB (still quite large, working on it still) but the site is still not working on mobile.
I have picked up on mobile it does keep refreshing the page as if it is having multiple attempts or some form of redirect to access the page.
I have myself been doing speedtests via pingdom tools and I was curious if you have any knowledge about the following: