Looks from your screenshot you are using outdated Safari browser without flexbox support. If you are using Windows you need to test your site on real Apple device or via browser emulators like BrowserStack since Apple didn’t support Windows version of Safari since 2011 (https://prnt.sc/sh7o9v).
We also have checked your site on real Macbook Pro with Safari 13 and it looks normal (http://prntscr.com/sh7itb).