About 90% of the complaints seen here about the functionality of AB seem to relate to Apple devices. (They're most often about iPads but I'm not surprised to see Macs get a mention as well). AB's techies just don't seem to test out the site with them.
Don't give up on trying different browsers though. I use Slimjet, which is available for Macs as well as for PCs:
https://www.slimjet.com/
In your Safari settings make sure you have block pop-ups on and also prevent cross-site tracking. Also hide IP address from trackers. Also helps if you don’t use Google, and have a VPN.
Probably shouldn't say this. Two/ three weeks ago was getting ads all over the page. Suddenly none. I have done nothing different, no ad blocker. Using my IPad as always.