Vertical scroll direction for Collections on Home Screen not showing all collections

[s1mwest 3]

Hi, as the title describes; I set the scroll direction on the client (web & iOS) to vertical for the Collections section on the Home Screen, and I can scroll vertically... but only 16 titles show.

When I click the Collections header I am taken to the Collections main page but only 16 titles are showing correctly, the remaining titles are just blank rectangles but I can scoll vertically

If i set the scroll direction to Horizontal or Auto (which sets Horizontal), I can scroll and see all the titles. And clicking on the Collections header takes me to the Collections main page where I can scroll vertically and see all titles.

I've got a large quantity of collections but only a few playlists and only a few items in My Media sections, so I don't know if this behaviour affects others.

Is this by design, or something I can remedy so that all titles show in Home Screen -> Collections whilst vertical is set?

Thank you