It sounds like you're encountering a flow issue with your checkout process in Odoo, where the "Continue to Payment" button is not functioning as expected. Here’s how you can approach fixing this:

1. Check the Checkout Flow Configuration:
   • Go to Website → Settings → Checkout.
   • Ensure that the steps in the checkout process are correctly set up (Address, Delivery, Payment, etc.). The "Continue to Payment" button should be configured to go from the address or delivery step directly to the payment step.
2. Custom Button Redirection Issue:
   • If you've created a custom button for direct payment redirection, there might be a conflict with the standard flow. Remove or disable the custom redirection button and let Odoo handle the navigation through the default process.
3. Inspect JavaScript:
   • If you’ve customized any JavaScript related to the checkout process, ensure the functions for the "Continue to Payment" button are properly handling the flow and not causing a redirect loop.
   • Open the browser console (F12) and check for any JavaScript errors that could be interrupting the process.
4. Ensure Correct Sequence of Steps:
   • The issue of being redirected between pages could be because the user is not completing the required steps before moving to the next one. Double-check that your Odoo checkout settings require users to complete each step (address, delivery, invoicing) before moving to the next.
5. Odoo Customization:
   • If you've done any customizations to the checkout process (for example, modifying the flow of steps or altering the functionality of buttons), ensure the logic is implemented correctly and that the "Continue to Payment" button triggers the right action.
6. Check for Custom Modules:
   • If you’re using any custom modules for the checkout or payment process, they could be causing conflicts. Temporarily disable them and see if the issue persists.
7. Clear Cache and Refresh:
   • Clear your browser cache and refresh the page to ensure that any recent changes are properly loaded.

Once these steps are checked, the "Continue to Payment" button should work as intended, following the correct flow from address input, through delivery, and to payment.

If you continue to have issues, reviewing any custom code or consulting with an Odoo developer might be necessary for more in-depth debugging.