Hi there, I'll let the dev team know.
Looking at the page you've linked the css seems to be displaying correctly but this could be as it was published a while ago.
Once you've activated the css option inside the pro tools plugin and publish the page, if you view the source do you see the compiled css file at all or is it still displaying a draft css?
Are you able to see us up an admin login so the developer can log into the site and take a look first hand? Please DM me the credentials (don't post on forum) and I'll forward on.