firstly, do you have some kind of redirect happening on your application? I pulled up the URL you provided and I see it gets redirected from https://originals.netlify.com to https://originals.netlify.com/#/ which will affect your paths.
Stylesheet vs Stylesheet and CSS vs css. Those two paths are NOT the same on a case sensitive system like ours, so if I were you i’d make sure that sure you standardize everything.
Also, the first link is a relative link with respect to the current directory, and the second is a relative link with respect to the root directory, so you’d want to check that as well.