Ok I see what you mean. I've compared with the online demo on http://allegro.tech/ralph/
and I haven't the same thing. I think it's a problem with cache on django or something like that (i've tried with 2 different browser). I tried ralph clean_cache ; ralph clean_pyc without success, would you have an idea ? I'm using vagrant in order to make a pre-version of my environnement before install it on a true server.