i had a quick look and adding this code to the css of a local custom component will fix it for you if you are using the Topic List Author theme component.
.full-width .contents .topic-list .topic-list-body .topic-list-item .topic-list-data.posters {
display: none;
}
.custom-author-column {
display: flex;
align-items: center;
justify-content: center;
}