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As soon as you open your page in the Sitebuilder it is redirecting to another website because of some javascript you have added to the page (it appears to be from widgetserver.com/syndication, and the javascript begins with "WIDGETBOX.subscriber.Main.onWidgetInfoResponse({"widgets":").
This code includes a redirect which is activating in the Sitebuilder. What you will need to do is remove the block of code from the page that you last added before the problem started. If the redirect is happening too quickly for the code to be removed, the only option is to re-create the page. If the redirect is important, you should wait to implement it until you are sure the page is completed and will not need to be changed.