They process then cancel orders if you use a virtual card number, like Eno, to protect your credit card number. Legitimate websites accept virtual card numbers (like Lowes, Home Depot, Amazon, Google Pay, etc). They do not accept Paypal or any method of payment that masks your credit card number.
Looks like they are one of the sites that try to capture your actual credit card number, meaning the likelihood of fraud afterward is very high. Avoid.