I have just tested the link from another computer and it seems to work fine from here. The page has been temporarily set to public so you can access it. (i.e. you don’t need to be logged in to the website). The website is running from a public server 24/7 so unless Google reCAPTCHA is somehow blocking you, I have no idea why the link is not working for you.
What happens when you try to connect to the website https://pinkpantheractivists.au ?
There was an automatic plugin update earlier today which happens quite frequently as there are many plugins on this website. I just checked the Simple Download Monitor plugin. It is still 3.9.16. The theme “Blocksy” also gets automatically updated from time to time Current version is 1.8.79
I just tried theme Twenty Seventeen. Same problem except with this theme, the title is shown as it should be.
Something else strange. I noticed that just one of the books “10 Days in A Mad house.epub” is downloading (no title display) but none of the other epub publications will download. Before this problem started happening they were all showing the title and all downloading OK with the same Blocksy theme.