SMS getting sent to totaly random numbers in a large group SMS

This evening I was setting up a 10 person SMS with 2 contacts which I had added to my phone a few moments before. I checked and double checked that all of the contacts were correct before I sent the message I had drafted. After this message was sent, I noticed that two of the contact bubbled were the faceless grey head icons instead of letters for these two new contacts and when I went to investigate, I found that my message had been sent to two seemingly entirely random numbers instead of the contacts which I had explicitly put in the top of my message. I did not have either of these numbers in my contacts and had not made or received any calls from these numbers before this message was sent. I have absolutely no idea where they came from. One of the numbers isn't even connected.

iPhone 11, Verizon - in case that matters.

Is this a bug? Has anyone else experienced this? Is this on the Apple side or the carrier side? This really really isn't a thing that should happen. Ever. Especially on an iPhone, regardless of who the carrier is.