A duplicate text sent to an unknown number

Yesterday, I sent my wife a text message, basically saying tell off your coworker. Within a minute, I received a message from an unknown number, just saying "?". Thinking it a scam message, I did some gentle poking. As it turns out, this is a real person who received a message from me telling them to tell off their coworker. Attached are the original message I sent my wife, as well as my conversation with this unknown number, in sequential order.

I have never seen this number before, I did not add it to a new message, I did not CC or BCC it, and it has not received any other texts from my conversation with my wife. Why did this happen, how many times has it happened to myself or others that we are not aware of, and how will T-mobile handle this issue so it will not happen again?

Android, Galaxy S22 Ultra