Atlantic firearms layaway error?

I recently made a purchase and put it on layaway. The first payment went through woth only some issue getting it to work.

Today, im.trying to make a payment and it consistently gives me a message saying it didn't add the payment to the cart.

I tried it with both the custom payment and the full payment, but got the same message.

Is this a site error? Is this a common occurrence, or am I the only one experiencing this?