In my experience this happens because you are requesting delivery reports for MMS from Chatty and that is causing the issue. Go to preferences, SMS/MMS Settings and then turning off Delivery Reports. After that do killall chatty in your terminal a few times until it says Chatty isn’t running then launch again. That should get rid of your duplicate messages. Also, the person who did most of the work for MMS in Chatty is very active in the Mobian Matrix chat, #mobian:matrix.org, so feel free to jump in there and ask questions. You’ll likely get much quicker responses.
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