Keeping the previous page "New"

Normally, when I hit the back button after entering a topic, the main page still shows the page as filled with new topics. But, now, if I enter a thread and hit "back," it topic page is refreshed so that only a few or no topics show as "new."

I haven't changed anything on my browser settings that I'm aware of. Is there something I can do to keep it the old way? Going back to a completely rearranged topic page every time is confusing and hard to keep track of.

Thanks!