Latest update causing major issue with blog

I did the latest theme update and now blog posts aren’t showing – usually the link https://www.emc.org.au/pets-in-the-park-is-back/ would take you to the post but it’s taking you to a new page with just the thumbnail of the feature image and when you click on it, it just reloads the page. It’s happening to all blog posts.

The page I need help with: [log in to see the link]