Why is the old cache returned in drupal 7?

Question

css

I am editing an old site on drupal 7. I changed one font-size value to another. Cleared cache using admin. drupal panels. Changes have appeared. But after some time, the old values ​​​​in css are returned back. As if the site is loading again from old, cached files. Why? Where to dig?

Answer 1

There is not enough data, where do you change styles, what caching systems, there are no restores from backup?
In a normal situation, this should not happen, because Drupal generates a file with styles (aggregation is enabled in the admin panel) and deletes old style caches.
Perhaps you still have a browser cache - you are on one computer, cleaned everything and reset everything, but after a while you sit down on another computer, and it uses the styles from its cache.