I can replicate the issue on three sites: GPI, GPBR, GPIN

Sort by Category = Story
(I tested with Pub and PR but could not replicate this issue using those Post Types)

Scroll down and upon reaching the 5th story the post will open without the user clicking on it.

GPI
https://www.greenpeace.org/international?s=&orderby=relevant&f[ptype][Story]=59

India
https://www.greenpeace.org/india/en/?s=&orderby=relevant&f[ptype][Story]=16

Brasil
https://www.greenpeace.org/brasil?s=&orderby=relevant&f[ptype][Blog]=16

I was unable to replicate the issue on these sites:
greece
new zealand
canada
netherlands (kkokkoro why is the NL search so much faster than everyone else's?)

I tried several scenarios, including different Issues, Campaigns and Content Types but only 'Story' seems to be affected.

Interestingly, I also tested with the GPI Dev site and changed the date on the 5th story ("How to fashion a better world"); this forced a different story called "Antarctic Ambassadors". When that story appears as 5th the issue is resolved. But when I change the date of the 'Fashion' story back to July and it appears again as 5th, the bug returns. I am Flushing Object Cache between each change/test.