Not all recipients are receiving my group texts
I am having an issue with group texts. I have "iMessage" turned on, "Group Messaging" turned on in my settings, and I have MMS Messaging turned on. But there are several people who, when I send them a text in a group, they do not receive the text. These people are also on iPhones. Also, (I have attached a screen shot), when I send a group text, why do people have to be "added to the conversation?" Didn't I add them when I instigated the original text message??? Note: in the string below, Laurany did NOT receive the text, despite me initially including her and Nancy adding her to the conversation.
iPhone 6s, iOS 9.2