Coupon code applied in Cart, disappears at Checkout

At the shopping cart page, Coupon code can be applied and calculates new total correctly.
Select checkout and the coupon disappears and item reverts to original full price.
In addition, the checkout page contains a header "Do you Have a Coupon or Voucher?"
but does not have any fields for coupon entry.
OC v 2.1
Any help appreciated

Further testing shows that if I disable module "X-shipping pro" then the coupon is maintained from cart to checkout.
a) any idea how I can fix this conflict?
Checkout page still shows "Do you Have a Coupon of Voucher?" but no way of selecting 'yes' or entering coupon details
b) any ideas on a fix for coupon entry at the checkout page?
Thanks

If disabling certain extension fixes the problem, disable it for now and contact extension's developer on the matter.

thekrotek wrote: ↑

Tue Nov 14, 2017 6:35 pm

If disabling certain extension fixes the problem, disable it for now and contact extension's developer on the matter.

This is the correct process to follow here.