When I send messages it comes up as being sent by a different contact
When I send a message to my girlfriend, it shows up as being sent by my mothers contact on my girlfriends phone. When I get sent a message it comes from her number, but when I reply to that message on my phone it shows as her having a conversation with my mothers email address. It will show up as 2 individual chats on her phone and 1 on mine. There is no easy way to explain it and yes, it is just as confusing as it sounds.