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 checked your account and yes, you are correct about deleting all submissions related to the jotforms in the screenshot. There are however several other jotforms that are still in your Trash folder and their total space usage is 4.24GB.
You should either purge the jotforms in there, or restore them and delete the submissions.
Do let us know if you have any further questions.