There is a bug in the software and I am not sure if this is the same bug that is causing your problem but I have an Inbox that shows unread messages but I cannot find them. I have also had people submit messages but they showed as read and so I missed them. Some of them I cannot even open. All of a sudden the messages items are very buggy. It could be that the backend of the system is messing up and not showing people the right information.