Changing background image of a theme applied on a form

I have done this with   mine but it is not  replacing it, although my forms shows the  right version

I can see that you've already confirmed on the previous thread, http://www.jotform.com/answers/667094, that the background image is already applied and everything works fine. Should you have any other questions or concerns, please feel free to let us know and we will be glad to help you. Thank you.