Soo, I've been trying to checkout Dynames at Amiami forever cause I was stuck at the login error after clicking Checkout.
I opened a new tab to Amiami (didnt close the old one) and I was able to check out from there successfully.
Somehow Amiami detects your ip/session/whatever if you managed to add it in your cart earlier and honours that you yoinked one. You can still check out after all the obstacles/waiting so don't give up or try stuff. I get this all the time on PO nights, kinda annoying tho(from the amount of time spent). Im not sure how long before its removed the cart.