My Last WordPress Publish Post is edited when I create a new post

It’s possible the database had somehow become corrupted. Before trying to identify what’s wrong there, let’s be sure there is not adverse theme or plugin interference. Switch to the twenty twenty-one theme and deactivate all plugins. Can you properly add new posts now? If so, narrow down the cause by restoring your normal theme and plugins one at a time, testing after each.

If the problem remains after putting WP in its default state, try re-installing WP itself from the updates screen.

Thanks bcworkz.
Here i would like ro tell you that, when I login with my chrome Incognito mode, then everything feels fine. But as soon as I open the website back to normal mode, I encounter this problem. But I would also like to point out that this does not happen on every new post. But every second new post is added to the old published post.

That’s a good clue! Try clearing your browser’s cache and clearing all of your site’s cookies. Where Chrome says “Clear cookies” on the security settings screen, don’t go there to do that (to clear cache, yes, but not your site’s cookies. Instead go to cookies and other site data, then “see all cookies”. There you can search for your site’s domain and only clear those cookies. The other way would clear ALL cookies from everywhere.

If that does not help, you’re probably using a browser extension that’s interfering. Likely candidates are privacy add-ons and ad blockers. You’ll want to exempt your own site from these anyway.