Not seeing credit card options on PayPal checkout

This may be more of a PayPal question (and I'm also asking their support) but I thought someone here might know the answer.

My client has a PayPal Payments Standard account. Within Membership, we are using PayPal Single Payments Gateway. When a user goes to the PayPal site to pay, the options shown are to pay with an existing PayPal account, or sign in as a guest... I don't see the usual "pay by credit card"

Any idea why?

If you want to see what I'm talking about, the page is http://graystoneofalmaden.org/signup