Thank You Message still appears when user comes back to the registration page

Also, if the user does go back using my browser or menu items, everytime the user comes back to the registration page, it is still on the "Thank You" screen.  Unless they refresh the browser.  

Hi,

I'm sorry to hear such issue, but I really believe this happens only in Wix websites. Wix uses flash and the form is placed into the page as an iFrame so when the user click back or just use the direct menu, the thank you screen is still there - again, because the form is placed into an iFrame and this iFrame doesn't auto refresh.

As suggested to your original thread, creating a custom thank you page to your Wix website and adding it as the form custom thank you URL should resolve the issue.

Thanks