urls modified when cloning a site?

I have noticed that when I clone my dev site back to my production site urls created on the dev site remain linked to the dev site. I would think that part of cloning a website is updating the urls to the new site. I wonder if something is wrong with my configuration. Can you help?

An example on workshop.moretango.org is the baner image at the top of any of the pages. They all link to workshopdev.moretango.org which is where we developed the website before moving it over to the new address.