I have noticed since upgrading to iOS 8 that my group messaging is acting weird and I am wondering if it has to do with having group members running iOS 7 with others running 8. I start a new thread with multiple people and then a new thread randomly starts with the same people. I end up with two or three different threads, but with the same people involved. Could this be due to adding or removing people from the group and iOS 7 not knowing how to handle it? Any thoughts? It's annoying to not have a continuous stream of messages in the same thread.