Same here. I call it text lag. I find it happens most on laggy servers (500MS or more), but it happens in other cases too. I'm not sure what causes it, but I am pretty sure that it has nothing to do with the text not reaching the server. I know that because sometimes I get it while I am hosting a game. My theroy is that it has something to do with the connection to the other players, and not the connection to the server.