We have had a couple blank submissions come through and would like to know if they can be restored

We've also had a few other blanks where no information at all is provided - completely blank submissions. You can see two of them in our submissions for the Week 1 Combo Doubles Registration form - submitted 10-18 at 17:50:36 and 17:38:18 respectively.

We are sorry for this issue. 

When I checked your submission for this form. I forwarded this issue to our developer. If he can be fixed, you will be notified via this thread. 

If you have more questions, please feel free to contact us at anytime. 

Thank you for your patience and understanding. 

Unfortunately, I do not have good news for you. Those submission were not restored by our developers. The only way to find the notification e-mail for them and import those data to submission page or edit them manually. 

https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms

If you have more questions, please let us know. 

Currently, only the individual who is submitting a registration receives a notification email from JotForm. Therefore, there's nothing we can do to restore the submissions.

It looks like the data for those submissions may be lost.  Were there payments received for those submissions?  If so, the email address for the submitter may have been included in the payment details.  That may be the only way to get some of the data for those submissions.