Sometimes payments show up on people’s bank account statements as “recurring” when they are in fact not. This is what Stripe, our payment processor has to say about it:

This is expected behavior: this "recurring" designation is necessary to save your customer's payment information for future use without re-entering their CVC code each time. The "recurring" flag does not necessarily indicate the customer is subscribed to a recurring billing plan, only that the card was saved for future charges.

For more information, please visit Stripe's FAQ: