Yesterday evening I opened my SO account and there was the red ball with a "1" at the top, notifying me about something new in my inbox. But when I clicked on "StackExchange" I saw on top only a comment I have already seen ([the third one on this answer](https://stackoverflow.com/a/12837152/626273)).

![enter image description here](https://i.stack.imgur.com/QvZWt.jpg)

But today when I opened my [last answer](https://meta.stackexchange.com/a/150044/158951) on meta I saw that it got a comment yesterday afternoon, I haven't seen yet.

**So, the red circle notified me yesterday evening correctly about a new comment, but that comment is missing in the inbox**, and so I missed to read it. It is still missing in the inbox, so I think this is a bug.