One-Page Checkout [Support Thread]

[lat9]

I have a site running ZC 1.5.8a, OPC 2.4.6 and COD payment.

When submitting an order it returns back to /checkout_one with a message "Your order's details have changed. Please review the current values and re-submit."

Console just shows

setFormSubmitButton, payment-module: cod
jquery.checkout_one.min.js?1692486216:7 Showing "confirm", paymentMethodHandlesSubmit (false)
jquery.checkout_one.min.js?1692486216:7 setFormSubmitButton, disabling Review and Confirm buttons.
jquery.checkout_one.min.js?1692486216:7 Setting orderConfirmed (0), submitter (null)
jquery.checkout_one.min.js?1692486216:7 jQuery version: 2.1.4

Any suggestions?

I've checked start and end hash values and they are not the same which is why the message is being displayed.
I don't see why cod module should be doing this though.

I can provide an opc log file if required.

While the log would be of interest, is there a reason that the site's using a version of jQuery from the last decade? The current jQuery version is 3.7.1.

Let me know if you need my direct email address for the log sending.