Sections missing when creating a placement

When trying to create a placement, the sections within a category do not appear. This applies to every category in every Zendesk region (brand).  

For example, on Mediaocean UK & Ireland, the category Buyer workflow (Prisma for Buyers) has 8 sections. See the following screen shot. 

But after selecting Buyer workflow (Prisma for Buyers), no sections are displayed. See the following screen shot. 

As a workaround, I need to search for the section to place my article. See the following screen shot. This is a major inconvenience.