Thanks for your reply. There are few evidence that system is supposed to work this way:

1. This is a Single page application. Which means, site only refreshes the part of the page which is updated. By definition if you have to refresh the whole page to see updated data, then application is broken.
2. If you navigate to different parts of the page, you can see latest data under feed and profile, but discussion is not getting updated. I saw a error in console while retrieving data and that could be the reason.

P.S. I have 11+ yrs of experience developing enterprise applications. There is no way this is not a bug.