This question already has an answer here:
I get to see a message "1 question with new activity" when a question is posted newly. I click on that question and view it. Then I click on my browser back button. I don't see this newly posted question, but instead I get to see the previous visited page because this comes from browser cache and not from Server.
Now, I no more get to see "1 question with new activity" message if a question is posted newly. I have to either refresh the page using F5 OR click on Tags and again revisit to see the new questions under that tab.