Description of the issue: Articles block: Not showing all Posts

At some various points, the Articles block stops showing Posts and it is
very inconsistent.
e.g. If I have 3 or 4 showing, it stops at 12, but when I show 5 it stops
at 10. six stops at 12 but 7 stops at 14, eight stops at 16 and nine stops
at 18 but after 10 there is no Load More button at all!

https://release.k8s.p4.greenpeace.org/international/press-centre/