Coupon is getting lost while finishing the order

Hello,

we are facing a following trouble with AWO coupons.

1) In Google Chrome browser

It works ok just in one case it gets broken.

If I fill the order and set online payment - then when I get back from payment gate into the website to check the order again before paying, the Coupon title gets lost from order summary and the total price is now without the discount.

2) In Mozilla

Here the coupon gets lost directly in the order form when I try to fill the address and other stuff - just when the page is changed via ajax due to changes in the form.

On the site is Joomla 3.8.1 + VM 3.0.12 + OnePageCheckout 2.0.353.250118

However when I disable OnePageCheckout plugin to keep standard checkout form, then when I try to set the Shipment or Payment method and the page reloads, the coupon also gets lost.

Thank you for help, it is quite urget issue as the marketing campaing for the client's eshop starts in February. If needed I can provide access to the site for checking.

Have a nice day,
Pavel

If coupon is being dropped after payment, then I would think you are dealing with this problem:
http://forum.virtuemart.net/index.php?topic=120972

In which case, going to awocoupon->configuration and updating order status to process coupon from 'order created' to confirmed statues should fix that.

But the coupon being dropped for just entering data is strange.  It works in one browser but not another?