This was a bug that showed up in version 7.1. I haven't fully identified what happens but one scenario is if you start replying to a message then get a new message pop into your inbox the patient attached to the new message will get attached to current message you are working with. If you then try to save this message it will go to the wrong chart. Our Triage nurse runs into this frequently because of the volume of message she is sending and receiving. I made Amazing Charts aware of bug and they saw it themselves, no fix yet:( It came in to play when the refresh button at the top of the messages screen on the main menu no longer clears the message box.