That might be a good thing to try, a new page that is setup for this might give you a better result.
To make a new page you can start with a blank page in your site. If you saved the form builder preset you can just reference the one that you saved to apply it to this new page. Once you have applied the CSS Form Builder form to the page you can then add in the Universal Email server behavior. It would be a good idea to give this a try again to see if it resolves the problem you are experiencing. If you get the same result the next time around then it would indicate that something else is going on.
Rather than delete the existing files you are working with you should just save them as backup copies, that way if you needed to get back to them you could. Please post back and let us know the result.