Every few weeks I see a text message appear in one of my conversations that appears to be sent by me, however the other person does not receive this message and I am absolutely not sending this message at the time. The message content is the same each time the message gets sent (it was a previous text I sent to someone) and it has a tiny film strip icon next to the time stamp. Can someone explain why the same text would be appearing in one of my conversations as if I sent it at that time but never did? Also, why doesn't the other person see the message and what does the film strip icon mean?
Thanks.