It works if you open the Page Builer Site, like your Link.
But not if you open the real Link (Public Link): [http://hofgadenstatt.ch/test-new]
That's excatly the Problem, after i created a new Article i have to open Page Builder and save the site there. After i did that the Article is visible in frontend. But if i create an Article and go directly to the frontend the new article is not visible.
Edit: I'm confused, it looks like it depends on the used browser. Normaly I work with Firefox and there it still does not work. But now I tried it with Chrome browser and there it's working.