Visiting my website with an URL suffix shows an outdated website

I have a custom domain called and an apex CNAME with target

Everything is configured so that when visiting in any web browser, it is redirected to which seems to conform to

The issue arises when visiting it shows an outdated webpage, that may not even be an old version of

Why and how to solve this?

Are you sure your browser is not simply using cached resources? (Shift+F5)