Website is not updating

my website is not updating. I published 2 posts yesterday. One post can be shown in the website (But sometimes it also disappears, when refreshed.)
But other one does not appear at all. I tried everything. Cleared cache. Disabled all the plugins. Cleared browser cache. But nothing happened.
I changed the theme as well. Even the theme change does not appear. It appears same as previously with the previous theme, without any change.
I checked via several devices, issue remains the same. For the WP-admin, all the changes are visible. when i logged out and checked, they are not visible.
I activated a theme via the cPanel instead of Wp admin. It’s also not visible.

Please help!