Sites that I used GitHub Actions to build and deploy Gatsby to GitHub Pages and then published are not displaying correctly.

I've tried building and deploying a site created with Gatby to GitHub Actions and publishing it to GitHub Pages, but the images and graphs don't show up or display well.

The site
repository

A site run with

gatsby develop

should look like the image below.

How can I get the site to display correctly?
Thank you in advance for your help.