I think what you're seeing is the effect of being logged in or not.
When you're logged in the behavior is controlled by your Preferences.
![SafariScreenSnapz277.png SafariScreenSnapz277.png](https://community.jmp.com/t5/image/serverpage/image-id/6575iDC609F6907BC8DA3/image-size/medium?v=v2&px=400)
The last item there is set on by default and will jump you to the first unread post in a topic.
If you're not logged in I think it will always start on the first page of a topic.
Let me know if this doesn't explain the behavior you're seeing.
-Jeff