Site not loading on IOS? - html

Since I don't have an Iphone. I have to test my site using site that there's available IOS tester.
I have reports that the site is not loading properly on Iphone.
Link: https://adthrone.com
But in the android version it works properly.
But in IOS not working properly
This is some details about the reports
The whole index.php is not loading (Blank page)
Sometimes it loads but some parts of the css/html of the page is missing.Like site logo in the navigational bar.
Sometimes the index.php loads but have multiple html/css issues
Android version works properly but not IOS.
The client has the following
Good internet connection
Have android & iphone for testing
Currently the site contains the ff:
Low quality images with file size of KB
Used bootstrap for front end
I just want to know the facts why this site is unstable when it comes to IOS mobile version.

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