Not sure if this question should be here or in High Sierra forum. This weird thing began yesterday. I changed nothing recently on my MacBook. When I get a message notification it says that the message is from person "x" but it actually is from person "y." The message displays the correct person in Messages. This has happened with multiple different people. The people are totally unrelated and their contact cards have no common info. I have not been able to identify a pattern. What could possibly make this happen?