Comments feed – admin user showing up as visitor

Hello,

I am referring to this website.

My main user who is Tara Miller has her own icon, and even when she is logged into wordpress when she replies to a comment it shows up as the visitor comment.

The code for the page is here
https://pastebin.com/eHNbfagv

Where by the image avatar.gif is supposed to be the authors image.

Any help would be much appreciated. I may just need to paste in some code from a working comments page?

Thanks,

Natasha