Group chat splits every time someone talks?

I'm in a group chat with 17 people; I personally have iMessage, but not everyone else does in the chat. For some reason, every time someone talks, it splits into a new group chat (for me only) that only shows 10 people (out of the 17) in it. If I text back in one of these separate group chats, only those 10 people receive my texts, and sometimes my texts don't go through at all. Pretty sure I'm the only person in this chat who's having the problem. I have an iPhone 7 and my phone is up to date. Any suggestions?

17 people… You looking for a way to kill yourself… Cause that will drive you insane

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