This issue is not reproducible in every browsers with any window sizes constantly
1. Create a site with some pages
2. Give one particular page 15 child pages
3. Create a web content structure with a text field and a link-to-page field
4. Create a template linked to the structure
5. Create a web content article with the new structure
6. Select a page from the link-to-page field and drill down to the page with the 15 child pages
(x)The pages are not displayed properly. Sometimes missing pages can be found, sometimes pages are duplicated.
(/)All pages should be visible.