Hi!
I see you are using a CDN provider for every asset on your site including the stylesheets and the images. When making changes in your site stylesheets don’t forget to clear the CDN cache as well, otherwise it will serve the last stored version. Some CDNs wil still serve the old file version for 12-24 hours after you change them.
If your site is under testing I suggest turning off CDN cache completely, otherwise you might experience delays in layout changes.