How to get rid of the side bit when my post is published?

Hi, new WordPress user here! I started posting recently, and when I publish anything, I always have text on the right of my post. It's exactly what I've written but copied and to the side? Does anybody know how to get rid of it? Thanks

https://preview.redd.it/qc79qnpiq8fd1.png?width=2728&format=png&auto=webp&s=f0a86113eb7318feb70d912a07ec8b7e4c778c98

https://preview.redd.it/duvfa5joq8fd1.png?width=2772&format=png&auto=webp&s=8463a092489fff6c9ba582198ceccaeacee23b8e