Several times I see the same notification which was seen by me previously is shown again as a "new inbox notification" with the "red ball". Why does it happen?
I observed when a lot of notification comes, say 12-14 in the morning, I see the oldest "notification" of that morning was already seen by me, say the on the previous night. And today I observed my latest single notification appeared twice within 2 minutes interval as a "new inbox notification" with the "red ball".
What does it mean? Why does it happen?