WordPress Child Style.css Not Working For All Sites

Hi, there. I have a site at http://www.dreamwave.org, and it has a problem that has been occurring with all of my sites (which are on the same server). The child theme style.css is simply not working. No matter what edits I make, they don't appear, and if they do, they must take hours before coming on. I tried disabling Varnish Cache, but to no avail. Could someone help me with this? Thanks!