My page does not redirect to the GOTO page

Hello,
I've been using Universal Email with great success for a few years now - but recently I set up a new form for a boarding kennel online reservation form and the visitor is not being redirected to the thankyou.html page as set up in the email message for the Go To Page (I am using Button: Submit pressed).

Here is the page with my form: http://www.moonlitekennels.com/ReservationForm.php

When the form is completed, the page just seems to reload. I need the visitor to be redirected to http://www.moonlitekennels.com/thankyou.html so they know the message went through.

The form data is emailed to me perfectly fine - it's just the redirect that isn't working. As I said, I've done dozens of these with success, but for some reason, this one just isn't working like all the rest!

Any assistance is greatly appreciated!
Sue