Hi @HAB
there is a check of your domain - ~~2,5 hours old - https://check-your-website.server-daten.de/?q=humansarebroken.com
Your certificate has only the non-www domain name.
CN=humansarebroken.com
21.04.2020
20.07.2020
expires in 90 days humansarebroken.com - 1 entry
So if someone uses the www version, that doesn’t work.
Create one certificate with both domain names, install that, recheck your domain. Then test, if Safari works. May be Safari has cached the www version.