group text of 13 people getting broken into multiple threads of only 10

I have been looking at multiple boards looking for a solution to this issue but have found none. I am in a group text with members of my softball team. There are 13 of us, myself included in the group text and are a mix of android and iphone users and one smartphone holdout that uses a flip phone. I will initiate a text to everyone in the group (12 people) and only two other participants' replies go to everyone. Multiple replies come in as separate group texts to only 10 people and it is...

group text of 13 people getting broken into multiple threads of only 10

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