CSS changes are not reflecting even after clearing the cache

I have updated CSS file from website but changes are not reflecting on web page.
I have tried clearing cache, opening private window but nothing works. Changes are saved on server.

Another thing I have noticed, the CSS url is returning the old CSS. Is there any thing I need to do to reflect my CSS changes.

Thanks in advance.

Even on deleting the CSS file from file manager not effecting anything. Is there any copy created for these files?

And this happening for main domain only, for sub domains its working.
Can anyone please help?

What you’re experiencing is your browser trying to be helpful by remembering the contents of the CSS file so it doesn’t need to load all files with every request.

Try to clear your browser cache and then check again.