@Fotis
I found out, that it was the problem with the menu item. I had create a "tag" view, not a "category" view. That was the issue.
Weird Urls are still available, but now the canonical works.
Question regarding k2 plugin Sh404sef: Yannick couldnt tell me, if the k2 plugin for sh404sef can redirect following url:
kauf-auf-rechnung24.com/mode/itemlist/category/39-buero.html
kauf-auf-rechnung24.com/schuhe/itemlist/category/39-buero.html
kauf-auf-rechnung24.com/technik/itemlist/category/39-buero.html
to
kauf-auf-rechnung24.com/buero.html
I that possible with the k2 plugin?
