Lately, the messaging app in Windows 8 has been malfunctioning. When I send an outgoing message, the original message pops up at the bottom like normal, but it is quickly followed by a duplicate of the same message directly underneath it. What's going on?
that happen to me also; and my opinion in this bug is when you send message to Facebook contact first it popup to the chat and send to Facebook message then when app flush the messages from Facebook it seem to be found new message and get it again so message appear to be duplicated