an update: I made it works with captcha 2, it shows the truck, hydrant and any picture. However, whatever it is - even the check mark is checked on the "I'm not a robot". When you click continue, it said "Human verification has failed! Please try again." Interesting?
Someone just use my website to brute force cardconnect. Now, cardconnect requires me to have Captcha in the payment form. Also, they require me to lock down the user if there are 3 failed payment or so on.