my outgoing text messages keep coming back to me in a separate text

[leslie8671]

I have a month old galaxy s6. This morning every text message that I send to people, those texts all come back to me in a separate text with an odd phone number... I have now texted four or five different people and every one of those text messages that I send come back in the same text to that weird phone number. I'm using the stock text messaging app. I've never had this happen before. It's only sending MY outgoing texts back to me. Not what they are responding to me. Any help?

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