Github pages custom domain removes jekyll theme formatting

I bought a custom domain name for a blog website I’m running on Gtihub pages. Now, when I open the site the jekyll theme formatting is completely gone and looks like what I’d run on my device locally. I tried installing jekyll/gem/bundler but I’m just so confused on it and can’t figure it out. I installed it but can’t run bundler in the cloned repo on my local device. The github page theme was the modernist theme.

How can I get back the theme formatting?

Website in question:

1 Like

what seems to be the problem ?

but as I am looking at Developer Tools, there are errors, maybe it’s related