What's going on here? What do you mean? I didn't do anything. Why did I send this message? Will someone steal the number?

The first picture has two interpretations.

1. Someone else filled in the wrong mobile phone number, and the verification code was sent to your mobile phone by mistake.

2. You can see this message if someone else binds it with your mobile phone number.

The intuition of the second picture is the second explanation of the first picture.

Because others may do some hidden operations through your number, because it is impossible to fill in the wrong mobile phone number.