Category pages content clipped

A very strange behavior showed up in our staging site. The site is a clone of a live site that we are rebuilding using the Spacious theme. All the pages with .category in the body specifier load, but the content is hidden.

When you go to View Source, the code is all there. But, if you check the CSS in an inspector tool in a browser, you see

.date, .category, .tags, .author, .comments {
clip: rect(1px, 1px, 1px, 1px);
height: 1px;
position: absolute;
overflow: hidden;
width: 1px;
}

The code is inline, so it is very difficult to tell where it is being created. I checked a database dump, and it’s not there.

The page I need help with: [log in to see the link]