Help on Github, pages won't display

Hi There
I am fairly new to Github and I learn as I go. I was asked by another user to turn my project into a Github page so that he can assist me with a question on my personal portfolio page. I figured out how to set this up and then realized that I needed to change the others to the same settings as others won’t be able to view them if I didn’t.

I’ve set the source to master branch and when I clicked on “your site is published at…” I found that 3 of my projects display 404.
I did rename some of my repositories, can this cause this?
I deleted the html file from one of them and loaded it again, this did not fix the problem.

Should I delete these repositories and recreate them, if yes what about the link back to my curriculum as this will now be different.

Thank you for assisting