@abelt88 You’re running the wrong command.
See how you’re running bundle exec jekyll serve.
That’s starting your development server, which you can see it hosts on http://127.0.0.1:4000.
Don’t do that, you can’t “host a server that way” on Netlify.
Use your build command, which seems to be bundle exec jekyll build.
See this Support Guide for more information:
https://answers.netlify.com/t/support-guide-can-i-run-a-web-server-http-listener-and-or-database-at-netlify/3078