Went back to some of the sites and most had to do with security or 2nd factor authentification.
The same sites on Android, Linux, or Windows ran fine. Chrome, Edge, Samsung Browser, Firefox.
I’ve got an image with the name, e-mail and other contact info, and asked Siri to create contacts from this page. My expectations about Siri were so low, that I was truly surprised the 6 contacts with all details were actually created perfectly in Contacts. 😮
Any chance this would be some sort of anti screenshot feature? Maybe take a photo of your phone screen and send that out instead: shooting at your screen.