How to repro:
- Go to any topic from the latest tab (here on Meta).
- Browse/read normally.
- Click someone’s username at top of their post. The usercard pops up.
- Click their username on the usercard.
- Allow full profile page to load.
- Click back button on browser. (For me, latest Chrome on Windows 8.1)
- Browser jumps back to home (latest tab) instead of back to the topic I was viewing.