Iframe not displaying on mobile

I am contracted to manage a website that was built by another person. The developer used divi to build the site and set up Iframe’s to pull in heavy equipment listings from machinerytrader.com. For some reason the listings are not displaying on mobile devices anymore. I have made sure security protocols are the same and everything displays correctly on desktops. The mobile preview on desktops even work. I am stumped as to what is going on. Can anyone help with this?

To add to this, I have tried to create an object and tried to embed the external page on the site and they still will not show on mobile. All of these methods have worked on desktop. The only thing that I can figure is there is some type of security settings blocking the display of machinetrader on mobile devices.

Thanks!

-Nathan

For reference the website is: https://www.ironpeddlers.com/equipment/used-equipment/compactors/

 

Thanks, I am starting to see that it works on some phones and not on others. I think people who are running safari on Iphones are having issues. My guess now is something with how the browser is interpreting the cookies is causing it from being displayed.