Messages send to me from 2 accounts

That's because you are listed as a member of the group and you are responding as "reply to all".
 
That should not happen. There is a coding error either in your SMS app or in the server software, neither of which you can fix.
 
Welcome to Android Central! Are you listed twice in the group? Do you have two different numbers that someone might have included in the group text?
 

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