Last update, this issue is closed.
It seems that there is an issue when I was trying to use the terminal built into the ajenti panel. I was using ajenti to try and make my life easier when I am not at home, but that turned out to be a bad idea. Anyway, everything works just fine when I ssh into my server using bitvise.
@człowiek-nuż that list just displays the files that are loaded by the browser when you visit the site. There's no way to hide that, and there's no point in hiding it, either. That list doesn't expose any sensitive information.
If nothing from plugins shows up there, then that just means that their forum doesn't load anything from the plugins when you visit it.