Why are there brackets around a text message that I received from someone

Hi PlayerX111,

Thanks for posting in Apple Support Communities. We'd like to get a bit more information to fully understand the question. Does this happen with all contacts or anyone in particular? Does this happen with the whole message or certain words? How does their message look on their end?

If part of the message or whole messages are missing, try the guidance in If you can't send or receive messages on your iPhone or iPad which should help get this sorted.

Take care.