Odd search archive layout

I set up a development site for a client about a year or so ago, and he has been diligently entering content. I haven't paid much attention until now, when it's finally almost ready to go live. I do a search and the search archive page has a strange layout. A ginormous image, followed by a description and read more link, but no article title, followed by the next, etc. It looks crazy and not easy to understand. I feel like maybe I messed it up somehow a year ago, but I don't have a clue what I might have done. Or maybe it's just a bug? I can't find any option to change the layout of the search archives anywhere in the customizer. The site doesn't have a blog archive page defined in settings, because it's all pages, so maybe that's the issue?