Portfolio Page not correctly loading on (old) Safari

Hey guys!

I’m trying to build our page based on a template and tried two different ones. “ArtDir” and “Obisidian” namely. Even if I just simply publish them without any changes, for both of them the exact same error occurs with older versions of Safari e.g. 14.1.3. The Page or header simply does not load and stays black. Chrome is working fine, it is only a problem on Safari and IPads. It changes however when I for example turned overflow on “visible” for one element.
But then still every other element is not shown and the page is therefore far from what the template should look like - see screenshot attached.

Home B - Obsidian - Webflow HTML website template is the page I tried it with and here is the read only link: Webflow - Zweiundachtzig_Master

Any ideas how we can fix this issue?