u/Cup-o-Noodless

Has this happened to anyone else? I had to switch over to Google messages, and it's creating group chats with random people from my contacts. I received a message from one person, and it made a group chat with people I haven't spoken to since middle school. It's really awkward, and I dont want it to keep happening. It also keeps remaking group chats over and over again. I have like 3 family groupchats. I've already checked to make sure my phone number is alright. Can anyone help?