No Products found at product category

Hello,

I added some outbord-engines as products in woocommerce. In the Shop-Page, I added a sidebar at the left side, which contains the “product-category”-widget from woocommerce.

But when I open(klick) a category, it says, that there are no products found.

I have searched a lot for solutions, but nothing helped.

My settings:
Permalinks:
Category-Basic: produktkategorie
Category-Basic Products: produktkategorie

Woocommerce Settings:
Standard Product-sort: Popularity (Sales)

All of my products are published and have prices.

Here is my Shop-Page: http://www.boot-yacht-muenster.de/aa_shop/

(Sorry for bad english, and wrong translations)