First I have to say this:
1. I looked in the forum and found topics about this issue from many years ago.
2. My location is Belgium which is timezone Brussels
3. I did not find a solution for my issue.
A page: I change it, I see the changes almost immediately. I disabled all caching plugins, I see the changes in the pages instantly.
Styles.css : I change it: I don't see a thing happening. I check in the debugging console in Chrome or Explorer, indeed, the old version.
Am I working in the right file? Simple, rename styles.css to blabla.css.
Indeed, the site becomes spaghetti ... brrr.
Rename it back, it takes a few minutes and there the site is: WITH THE OLD VERSION
Sleep on it, after a night, changes are visible ... not to my expectances. Change it back ...wait a day?
Tried almost everything, so I need help..