I can't tell if it is a bug specifically in this forum, my OS or a Discourse bug, but if I'm viewing someone else's activity, then I open the sidebar and click "Activity", only the profile switches to mine, not the activity, and the website, kind of breaks.
Loads fine for me:
Sometimes the website breaks when you load it and you need to do a hard refresh. Have you tried that?
What I meant was loading someone else's activity then using the sidebar/popup to switch to your own. For me it just switches the name and the profile and not the activity.
Well no matter what, it's probably not snap's fault. You may want to ask about it on the discourse forum.