Customers cannot choose a new payment method after placing an order

New Member
1 0 0

I made a manual payment method myself, the name is paydemo, I used him to create an order (no payment), and then I clicked the back button at the top left of the browser to return to the page to choose the payment method to reselect the payment method, but This order seems to be bound no matter how I choose it, he will jump to the thank you page and the payment method is paydemo.

Anyone can help me, thanks!