Custom CSS not appearing correctly on PCs

Hi there!

I recently designed a small website for a client with some custom css and also some animations. The site looks great for mac users, but appears to be quite broken on PCs. Any reason why this would be the case?

The custom attributes are snap scrolls, and a swipe/reveal new image on scroll on the left side. On PCs, there are 2 scroll bars that appear, and the swipe/reveal new image does not work.

Here is the website:

Here is my site Read-Only: [LINK][1]