Author displays on posts when accessed by category filter

Hello there!
I’m having a hard time figuring out how to remove the author when users access my posts using the category filter. Here is a link to a video of what we are seeing: https://www.screencast.com/t/sJ70z9CGnT.

I’ve put in login details in the private area so you can also see the coding we are using to hide the blog author in the General Styling CSS area:
<!– Remove blog author –>
.blog-author { display: none !important; }

Thank you!