Moblie CSS issue in iPhone devices

The page isn't rendering properly in iPhone X, and iPhone 8 devices. Getting the following layout, when loaded initially:
https://static.livechatinc.com/8801096/P5IKB5K84O/e5115991a9902e47675232b41d6c9058/IMG_533CF388D32C-1.jpeg

However, it loads fine once the page is refreshed. It works fine in Simulator, the issue seems to be specifically when accessed via the phone physically.