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Actually that on how you have configured your payment question. Do you have any product added in your payment question which has $0 price?
I did check your last edited form "Register English" and found that your payment question "Classes" is not a required field. That means user can submit the form without making payment.
Did these submissions ended up in incomplete payments and you manually completed it?
Do let us know and we will try to figure out the issue.
We will wait for your response.