It may happen that a post you wrote in WordPress is modified by error!
It happened to me: this morning when I went to see a two years old post of mine, I did not find anymore an information I was sure I wrote. May be it happened to you too, but don’t worry! You can recover any previous version of a post you saved, even after years and the procedure is very easy 😉
First check that, in Screen settings, it is checked the Revision checkbox:
Then you can notice that there is a Revision item on the Publish right section, with the number of revisions that post has and a Scroll link that allows you to see all of them:
You can move left the time arrow to get previous versions that post had during the time:
When you reach the version of the post you want to restore, you have to click on the Recover this version button:
You can find the list of all revisions also at the botton of the edit page, in the Revision section where you can select one of them too: