Nice and simple to use, and great choice of fonts! Two things:
#1 Why do you have two URL's that point to the same location? This has no benefit, and only serves to confuse search engines. Furthermore, it may create issues with the X3 CACHE system, because pages will inconsistently get built with different URLs in mind, which cross each other. If you must have both URL's, then I recommend redirecting one to the other.
#2 You have a few pages with this layout:
http://galerie.rojka.de/galerie/portfolio/hochzeiten/
In the page FOLDERS settings, try to remove the text-center class. I think the text will look better left-aligned for this layout:
In next release, this will be automatic ...