Content is not visible for guests

It worked properly a couple of days ago, but now I can only see the content of the topics if I'm signed in. Guests just see a blank page.

You can observe this on my UserEcho page:
https://tweaker.userecho.com/

Here's how it looks for guests:
https://i.imgur.com/MQyJZJu.png

The homepage looks fine, and if I'm signed in it looks fine as well.