I am using Google Chrome. There are multiple tabs of Stack Overflow are open. When there is any message arrives in Inbox then it appears at top left corner of every tab. What I did is right-clicked on message and selected open in new tab. And then for hiding inbox popup I clicked outside the box. Then I went to any link/webpage. Then clicked on back button which Chrome has at top left corner. What I see is there is again same message appearing in inbox. To get actual result of inbox need to do refresh or click on any link within site.
Actually whenever I move to Stack Overflow page it should recheck for any message arrived and not use buffer data.