Thanks for your kind regards,
i think it also would be helpful for you to know which plugins i use.
As by now i’ve already tried to deactivate all of the Plugins an try it then. This also does not work.
This are the active plugins in the German shop:
All In One SEO pack, BackWPUp, Banner Management for WooCommerce, Better Search Repalce, Easy Updates Manager, Enhanced Media Library, Google Language Translator, Mobile Menu, Multilingual Press, Open Graph for Facebook, Google+ and Twitter Card Tags, Shariff Wrapper,Simple Custom CSS and JS, Slim Jetpack, TinyMCE Advanced, W3 Total Cache, WooCommerce, WooCommerce Breadcrumbs, WooCommerce Germanized, WooCommerce Multisite Product Sync, WooCommerce Product Bundles, WP Maintenance Mode.