I am having the same problem on my site – ‘trending posts’ is showing my posts in chronological order (oldest first) rather than most visited.
When I visit: Settings > WordPress Popular Posts > Stats
I can see the list of my posted visited posts, which doesn’t correspond with what is actually showing up in the ‘trending posts’ section.
I’ve tried turning off plugins but that hasn’t seemed to work. Is there anything you can suggest? Or might you be able to please take a look for me?