Misunderstandings are normal, but they can be worse via SMS because you can’t see the face of the other person. Maybe one of the participants said something that other people did not understand, or maybe one of your messages was misunderstood by a participant. Someone in your group may have said something they did not mean to say. Things like this can be embarrassing and they can also cause conflict or problems.
If anything like this happens, keep calm and explain to the group that the message was not meant for them, or explain what the SMS really meant in more detail. It is better to be honest and admit that a mistake was made, rather than ignore it.