How can I make the comments start below the users' avatar?

Hello,

When someone publishes a comment in any of my posts, his comment starts at the right of his avatar and nickname instead of starting below.

If you go to https://jayus.es/games-with-gold-o-como-microsoft-no-podria-hacerlo-peor/#comments you’ll see what I mean.

It’s very frustrating and it breaks the structure and aesthetics of my site.

Thank you in advance for the help.