Document changes made by the same user is not recorded within the history of the document (versions). Even if the user makes changes, after long periods (eg: hours, days or weeks later) the history does not create a new record, rather the existing history record is updated.
This means, if a single user is updating a document, the document will only have 1 history, which is same as the current document version. Therefore, user cannot track nor revert to an older version of the document.
However, the history does work, if another user makes changes to the document.
Attached document was initially created and updated approximately 1 month ago, however the first history record is same as the current document, with the current date.