I wonder why the breadcrumbs and left TOC menu shows links it should not show?

I wonder why the breadcrumbs and left TOC menu shows links it should not show. It makes it look way to complicated.

Look at the screenshot and i guess everybody can see this on his own portal. Why does it need to show the knowledge base url in the breadcrumbs menu. This does not make any sense and adds extra lines and difficulties moving around on the website.

Also the breadcrumbs dont work, but i already reported this