Can anyone explain why do I see my own posts as new and unread in the Active Discussion panel? As far as I remember, my posts were displayed as read before, but recently this has changed.

Currently no, but, please describe what you've done to make 2 posts with the same content within a flood delay interval. I can't repeat it.

I do not create two same posts at one time, the thing is, that I write a single reply, go back to the main page and see my post marked new-unread in the active discussion. And I think that this didn't happen before.