I think this is a consecuence from topic title duplicated in header’s bug.
Steps to repro:
- Open some topic with at least 3 messages (example).
- Go to message number 3 (or 5, or 10, or whatever you want).
- Click on title bar (with the title of topic).
- That’s it. Now, you goes to “top of topic” and you have the double title instead the title of topic and the title of forum. :’(
Tested here, right now: