This happens in both the new and old versions (I've toggled back and forth). I show that there are four new messages in my inbox. But when I click on it, it says that there are no new requests and no new notifications. It zeroes out (even the 4 in the browser tab goes away). Then after a while, it pops back up. Reloading the page doesn't bring it back up. I just notice it later when I don't close the tab.