Was just talking about this with my wife. We had an extended family group chat come in that was an absolute disaster with each of us getting several messages per response. I believe this is because it contains a mix of android users and we were discussing how Apple forces us to have a worse experience to maintain their exclusivity.
It’s because it falls back to MMS with android users in the group which does have a weird duplication issue. Best bet is to use another platform for group chats (Signal is excellent but WhatsApp may be a path of less resistance)