I have found a minor bug on the Stack Overflow Website. The notifications are not getting refreshed automatically when we click on some particular notification and click the back button, The notification is still there and it does not get auto refresh. Here are some screenshots.
When we click on the notification and view it. When I click the back button on the browser, The notification is still there. In this way if the user wants to go back to the previous page then the user will always be confused if the notification is new or old. My browser is Mozilla Firefox 70.0.1.