What's with the jumbled squares in the text message?

At that time, I also received a problem with the other party's mobile phone, but only one person's text message was like that, and everyone else was fine. Under normal circumstances, this happens when the other party writes two short messages at a time and you receive one.

This question is too professional. Only in this case did I receive the garbled code. I don't know the specific reason. I don't know about you, but it certainly doesn't affect my mobile phone.