I’ve been noticing this for a while but thought I would finally report it.
If I reply to a topic and then quickly return to the home page, usually using a keyboard shortcut, after a short delay I see the “One Unread Message” (or similar language) notification at the top of the page—but it’s for my own recent reply.
I’m assuming this is just a small race, but it could also be specific to our installation. Has anyone else noticed this? Just a minor irritation, but I keep waiting for it to stop and it hasn’t yet…