This link showed up on the front page as a post about the search for the secret cow level, posted to the diablo community, but clicking it sometimes shows a post about The Mets and sometimes it’s a post about dating advice in the phillipines community.
Note that URL in screenshot is the same as the link I posted, and the right column shows correct community info.
Reloading the page replaced the content with the correct post about diablo.
I’ve also had it happen with only one tab loaded, so I’m not sure that it is related to having multiple tabs open (although it might be due to websockets again).