The solution is "wait and stop bumping threads" because somehow Paizo decided that 2 people were enough when they are releasing their greatest sale in years. So, we wait ¯\_(ツ)_/¯
I actually can see only 3 boxes (Cart, payment, place your order): 1 and 2 are green, 3rd is black and once I press "PLACE ORDER" all those boxes disappear, and I'm left with the rest of the screen.