Based on what we checked, it seems like Windows Safari browser doesn't support many modern web standards like display: flex; , you can check my attached screenshot below this is what i inspect element on the Windows Safari browser console tool.

And Apple already discontinuing Safari on Windows.

Reference link : https://stackoverflow.com/questions/46081776/flexbox-not-working-in-safari-5-1-windows

1. Switch to another modern browser to view your website.

Or

2. Apply this custom css hack into your current Easysocial custom.css file.

        body #es .es-container {

          display: -webkit-box;

          width: 76%;

        }



        body #es .es-content {

          display: table;

          width: 100%;

        }

But i am not advise to apply this custom css hack, it might affect other thing as well, but you can give it a try and see how it goes.

Thank You for your reply

You are most welcome Eric