Why is the version of my website that appears when using the links in Publishing Settings different from the one I'm working on and is saved.

I have built a site on Yola and whilst doing so - used the preview function. So the pages are saved and the preview looks fine.

However when I use the "Update my site" - publishing settings function it shows me the two web addresses that my site is available at - one address I bought and already owned (this is now pointing at the Yola address) and the other is the Yola address. When I click on either of these the website shown is a version much earlier then I am working on.

Can you explain how to publish the latest version and of course not lose any of the work completed.