If you click on the weekly challenge sub-quest, the guild quest collapses on the menu and you can't open it.
If you reload the page, the guild quest comes back, but then collapses again, unable to be opened.
Even the text is wrong on the guild quest after it collapses. Instead it shows a weekly subquest in its place.
someone posted this link in chat, same issue:
https://imgur.com/a/rqK34vw