Website section not updating

I have several links on the home page to sections on my site. One of these – ‘Latest News’ – has not updated since around Nov 2012; I have no idea why. I have posted 4 updates since then; all of these are visible on the front page, and can be accessed by clicking on the individual front page links to each of these posts, but if I go into the main ‘latest News’ section itself, they are all missing; the last post visible is from Nov. 2012. I have not changed any settings in WP, so have no idea why this is happening. I previously had a problem with the ‘WP Supercache’ preventing the front page slideshow from updating, but that has finally updated itself. This problem seems to be more serious.
Website url:
https://www.placesandseasons.com/