There are official discourse themes (created by the discourse team, like the light and dark themes), and unofficial themes. If an official theme breaks, the discourse team should fix it, but if an unofficial theme breaks, you should ask the theme creator to fix, after all, it would be unviable for the discourse team to fix each and every theme that breaks (anyone can post a theme here in the forum, including you and me).
What broke the css is probably a change made by the discourse team that affected (unintentionally) the css of the theme, in which case the theme creator should fix, or you can fork their repository and fix the changes yourself. Or you can hire someone at the Marketplace. It might not be what you wanted, but there’s nothing much to do here for unofficial themes, unfortunately. The good thing is: the fix seems to be easy as I showed in my previous post.
That said, it seems that this theme is owned by discourse, because the repository is:
https://github.com/discourse/zeronoise
So maybe you can ask the discourse team, unless there’s something I’m overlooking.
You can see that the problem is really in the theme by accessing safe-mode at: https://forum.actionvfx.com/safe-mode
Then, disable only the theme and press ok: the descriptions will be aligned.