How do I get rid of the "by:" (byline) that shows up after my article teaser?

I have created a "more articles by this author" block, which includes the article's image, title and content teaser. But for some reason, at the bottom of the teaser it also shows a "by:", which looks like it comes from the new "Author" page.

I've looked around to see where it is coming from, but can't seem to find the source.

I have included a screenshot.

Thank you.