Clicking on “Checkout” sends me to bottom of checkout page

I’m using your plug-in to allow customers to pay their bills for my client, but when the enter the amount, go to the cart, then click on checkout, the result is that they end up on the bottom of the checkout at the payment options, not at the top where they fill in their personal information. I have several other WooCommerce shop sites and they act normal (where arriving at the top of the checkout page is normal). Only on this site and this company’s sister site do they arrive at the bottom and I’m using your plug-in on both of them. This leads me to believe that your plug-in could possibly be the reason why. Is this true? If not, would you know why these two sites are acting this way?

The page I need help with: [log in to see the link]