What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Upon cloning your form and testing the Question Spacing feature on the Field Styles tab (shown below),
it worked fine. However, since you're using the form's full source in your web page, you would need to replace it with the updated code each time a change is made in the form builder. That's why the changes aren't taking effect.
Please see this guide on the differences between the various embed methods.