I just got two notifications I had already read yesterday. Again. They just appeared on the top of my notification list as unread. Thanks for telling me the same thing twice, Discourse, but I'm not retarded.
Were they Jeffed posts notifications? They can only be marked read from the Notifications screen by using 'Mark All Read'.<!-- Emoji'd by MobileEmoji 0.2.0-->
Nope, they were notifications I had already read and that Discourse had previously marked as read until 2 minutes ago.
I've also had this today.