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.
It will help us understand better about the problem if you can provide us with more appropriate information.
Can you please share to us the URL of the website where the form was embedded so that we can test the form.
I also suggest checking this related user guide -How-can-I-receive-SSL-Submissions
You should also check if there were embedded content on your form like images, banners, shortcut links.. that were using non secure URL (http) -- because if your website is using security certificate and https protocol, most likely the browser will be able to detect non-secured contents on the form itself.