It's called your internet/browser fucked up and decided to display the page in (nearly?) raw html or whatever the forums use, refresh the page or restart your browser next time
First time i did this was when I was at home, I restarted on that and it was like that
I'm now on my workstation at work and it was still the same, when the post was made.
'You are always moving, even when your standing still.' Me - 2016