I just tried it, once I selected Secure Checkout it took me to Checkout Method... where it prompts to sign up as a New Customer or sign in as an Existing Customer.
Have you tried clearing your browsers cache?
@Dork_Knight started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I just tried it, once I selected Secure Checkout it took me to Checkout Method... where it prompts to sign up as a New Customer or sign in as an Existing Customer.
Have you tried clearing your browsers cache?