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.
I have cloned your form and tested on my side.
I have experienced that "Sliders with Calculated Result" widget does not display on the preview version of the form.
As a solution, I have injected the following CSS codes into the widget:
Moreover, I recommend you to set the widget height 300px to appear better on the form as you can see below:
Your form is fixed as you can see the screenshot below:
Please try and if you need any further assistance, let us know.