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That shouldn't happen since the form is set up to redirect to the payment gateway to then collect the payment from the transaction after the form has been submitted.
Upon checking your form further I discovered that this form currently has 43 pending submissions so I think this is the reason why since if the user went back and finished it the payment may have gone through but still not shown up because it is still listed as Incomplete so most likely you will find the Missing Ones in there. Please see Incomplete Payments for more information on this. This usually happens for reasons such as if the window gets closed before the redirection happens.