Default HELP - AT&T Group Messaging Limit

Whenever somebody includes me in a group message/text/conversation that has more than 10 people in it, my messaging app (Hangouts) splits the conversation into 4-5 different conversations each with 10 people. What i've noticed is that each conversation includes the same people but maybe 1 person different from the other conversations. Whenever somebody replies it puts his/her message on there own conversation with 10 people. But whenever the group message/text/conversation contains 10 people or less, it works just fine with no problems and I can see all the messages on a single chat window. Please help! is there anything I can do about this!? I never used to have this problem when I had Sprint.