Hello,
When I update existing posts and add new posts, deploys are published without issue. However, for some reasons my posts do not get updated or new post do not get added to my site. I have no issues updating other sections of my site.
As far as I can tell (I have a reliable way to check), we are serving the latest deploy on all of our CDN nodes.
So it sounds like perhaps we are not building what you intend, and thus not serving it. Could you download a copy of your build and confirm that it matches what you get when you build the same commit locally? You can download a copy of any commit from its logs page (e.g. Netlify App from our last build), from the icon shown in this screenshot: