Group text going into individual text threads

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http://forums.androidcentral.com – Have an S4 active and have a group text message going on with about 10 people. I also have individual texts going on with some of the same people in the group message. None of the text from the people I have an individual text thread with show up in the group thread when they send a group message. So both the individual texts and group texts show up as individual texts from that person. Anyone know how to fix this? (HowTos)