Highlights page for all games only display JSON code

The highlights page (in the GAMES tab) only display JSON text, instead of the regular frames, with images and links. It’s like a webpage that is not redered, instead, the source code is simply dumped on the screen. It happens in all games, regardless of owning or not, being installed or not.

Any tips on what could be the cause? I already removed and reinstalled the desktop app, as well as logged on and off several times, with no success.

This is the start of the code that appears in the Diablo page: