I have an app that costs $18 per month [1]. Everyday, I get about 5-10 paying customers. Today, I got around 1000 paying customers with valid credit card payments in 1 hour. I wrote to Braintree and they have cancelled these payments as "Processor Declined". But, the subscriptions are still active. Will this charge the credit cards every month? Curious, why this happened? Anyone had similar experience?

[1] https://formfacade.com/braintree/pay/website/premium