S7 edge updated-old group text messages being split-1 thread is my texts and other is every elses
after updating S7 edge from android 7 to 8, my old group text messages, which were restored from backup after updating, are not appearing correctly. A group thread will show as 2 separate threads with generally one showing my texts and the other showing everyone elses. the one with my responses is "inactive" next to it in red and if you click on it, a pop up says "you have already left this chat and it has been closed". This is very annoying. Any idea what is causing this and is there a fix?