2 major problems

When I am typing the mesage deletes itself out, thats been happening a while, but now as of yesterday when I send/receive a text it has this underneath every text I send or receive, it says ———=_Part_1546922_1662774219.1449760696898 and the last 6 numbers change overtime, this is so frustrating I love being able to text from my macbook, but this pretty much has ruined it for me, please fix this!!!!!!!!

potterdood about Message+