Getting a weird glitch with time stamps on imessage on my mac. Running High Sierra. It looks like the stamp is correct for all the messages I send, but the messages I receive have an inexplicable timestamp. Also, the time stamps are 100% correct when looking at the same messages on my iphone. For example, I just sent a message today at 12:15pm. Both my mac and my iphone show the correct timestamp. I then received a reply at 12:17pm. My iphone imessage shows a 12:17pm timestamp but imessage on my mac shows 7:29am! That's a bizarre change! What could be the problem?