number parameter acting weird

Hi,
the plugin is really great and very flexible. I tried to just list 4 sibling-pages within a certain page, and for some reason random numbers of links are being displayed. I use DIVI and currently have no idea what might be wrong.

[siblings number=”4″ class=”page-list-cols-2″]

This should create two columns with two links in each. There are 19 sibling pages available as can be seen at the end of the page https://b34892.myraidbox.de/funktionen/kontakte-verwalten/anmeldeseiten/ where I simply use [siblings depth=”1″ class=”page-list-cols-3 pagelist_dark” sort_column=”post_title” sort_order=”asc”] without a number limit.

In th DIVI desktop preview 4 links are displayed (although from a completely different parent page), in the saved output page only 2 links are displayed. Using numbers higher than 4 results in 3 links being displayed (I tested up to 10).

The page I need help with: [log in to see the link]