My categories of wikis are not shown in the categories-setup

I have a membership called "Basic" and I set restrictions to a page called "wiki" and to the slug called "", so "Basic" is allowed to view all wikis.

1) The posts/wikis can be viewed by "Basic", that´s OK
2) The wikis have categories and tags, if a non-admin choose to order it by one of the two, the slug .../wiki/categories/<name_of_categorie> shows an empty page

I think it´s important to say, that for admin it works fine.
I have this problem on multisite even on main-site as on sub-site

(My wiki-plugin is encyclopedia_pro)

Now I tried to setup categories as well, but they are not shown in the categories-setup

I would need help for this, Thanks