The issue is that I'm in a group chat of 5 members consisting on iPhones and 2 Android users. My texts are sent to the group chat fine, but most of the time, their texts get sent to me separately. It says subject, a time, and an expire date. I have to tap to download the message, and then it gets sent directly to the group chat and then i can read their text. It was having the same issue on the stock messaging app and android messages. My carrier is Sprint.