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 seems that you figured the issue by yourself. I noticed the checkboxes on the form, however there was an extra space which was resulting in an additional empty check box.
Removing the extra space at the end of the last option will fix this.
Hope this helps.
If you still face any issue let us know and we will help you further.