I don’t know if there’s been an update to the forum, but I suspect so. I use the Manjaro Dark2 Material Theme, and this morning when I opened the forum all the colours were…wonky. See below for an example:
Mine look exactly like the original post. I had to change to a light theme to be able to read anything. I am using Firefox, but I have been using FF and that same dark theme forever. It just changed some time today.