It seems to be a bug (it represents “unread” messages, but you’re not even tracking or watching these topics ! You often didn’t even ever enter them). Now, it’s the same for me: It’s quite “occasional”. It would be good to find one day where it comes from and to solve it.
Ungelesene Nachrichten blaue Zahlen erscheinen in „Latest“ in letzter Zeit (wenn sie nicht sollten)?
2 „Gefällt mir“