title: GitHub Pages Jekyll theme working for pages but not for posts
body: <p>I have a Jekyll-based GitHub Pages blog using a slightly modified Hyde theme. It has four pages using the 'page' layout that can be accessed using the permanent sidebar: Blog, About, Projects, and Publications. Here is what these pages look like:</p>
  
  <p><img src="https://i.imgur.com/iIOKAqP.png" alt="Imgur"></p>
  
  <p>The Blog and Project pages have sub-pages that use 'post' and 'project' layouts, respectively. They were working fine for several months without a problem, but yesterday after making a new post, I found that the theme is no longer working for my posts or projects, even though it continues to work for my pages. This is what my posts look like:</p>
  
  <p><img src="https://i.imgur.com/IeVpZm3.png" alt="Imgur"></p>
  
  <p>All the content is there for the sidebar and post, and the Markdown is rendered, but the Jekyll theme doesn't seem to be working. My project pages look similar.</p>
  
  <p>I am very confused because I had not changed anything related to the theme or layouts in about two months, and I know my site was working normally even a few days ago. This problem seemed to come out of nowhere and I have had no luck finding a solution.</p>
  
  <p>Here is the repository for the site: <a href="https://github.com/rgriff23/rgriff23.github.io" rel="nofollow noreferrer">https://github.com/rgriff23/rgriff23.github.io</a></p>