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 did check your account and found that you have one form with 286 submissions. You also seems to have 5 forms in your "Trash" folder and all the forms has several submissions. That is the reason why you are receiving warning emails.
I would suggest you to please go ahead and "Purge" the forms and that should solve your problem. Please check the screenshot below: