Group Text coming in as individual messages

I have the same issue, I was trying to figure out if it was my phone or T-Mobile. Everytime I do group messages most of them go to individual messages and I have to download them, which causes me to miss many messages in the conversation. It makes me so mad and I've been ready to switch carriers. I have the Samsung Galaxy S21 ultra, I have reviewed all the replies for ideas but none are on my phone to try. It's not every response, only some of them, and it doesn't even matter how long the message is.