Blue dot for sent messages on iPhone 13

I have a iPhone 13, sometimes when I text people a blue dot appears on the left hand side as if I have a message but it’s only the message I sent. It makes me feel like my phone is hacked or something. Why is this happening?

[Re-Titled by Moderator]

Original Title: blue dot shows up on left hand side like i have a message but it i that messaged the person.