My form does not look or behave as expected on some computers. The look of the form is incorrect, with the graphic not showing and colors wrong. It also had an Adobe Forms Central ad promoting a free account. After they fill out all the fields the Submit button is grayed out and not clickable. I have witnessed it doing this on the same computer from both IE and Chrome browsers.
Please send me a private message with a link to your form and we'll take a look.