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.
Could you please provide us more details of the problem you are having?
I do not have a Mac computer to test it fully, but I have a simulator that I used to view your form and was able to submit without any problems. Here's a screencast of it:
I'm testing your website using a Mac OS X Yosemite 10.10.5. If you are getting any error messages, please do let us know, a screenshot would also help us a lot. Here's a guide on how to take a screenshot on Mac: https://support.apple.com/en-ph/HT201361
You could also try using a different browser like Chrome and see if the problem persists.
We'll wait for your response.