HowToGeek broken

#1

I’ve been reading https://howtogeek.com for a long time, but lately it’s breaking. Specifically, when I click into the feed and select any of the stories, it “takes over” my newsblur window. Columns on the right and left-hand sides of the screen cover up everything, with blank white in the middle. The URL bar still shows newsblur.com but it looks like it tried to load howtogeek and failed partway through. The feed itself seems to work fine - it updates, I see new stories. But I can’t read them on my desktop. Using the app in Safari works fine. This happens when I have “Original” or “Feed”, but not “Text” or “Story” selected (I figured that out while opening this ticket).

OS: macOs Mojave
Browser: Safari 12.1.2