What is the problem exactly? what happens (or how your screen looks) when you try to edit your post?

You can probably fix this by applying some CSS changes to the site, that were posted by @1 some weeks ago. (I don't remember the original thread) Use a chrome extension that can apply CSS changes to websites (I use the extension "Stylebot").

Let it access speedrun.com, and then paste the text in this pastebin: https://pastebin.com/4GyEPMac

Those changes will get rid of the right sidebar while viewing the forums or game leaderboards, and extend the center bar to fit the entire screen.

I understand. Just note that this wasn't meant for fixing any bugs, just returning the forums/leaderboard pages to be similar to how they were before. I just noticed that I can see your forum post just fine with the wide center bar.

You can report that bug in the support hub I guess; none of us can fix that without workarounds like mine.

Now that I was reminded of it from other thread, right now there is a max limit of 1000 characters for each forum post (which is very short). So you probably couldn't update your post either way :( Feel free to complain about it too.