It’s not showing to me, you need to clear the cache.
But because of and coupon layout issue you need to replace this code.
.woocommerce-checkout .woocommerce form.checkout_coupon{
display:block!important;
}
by this one
.woocommerce-checkout .woocommerce .checkout_coupon {
display: block!important;
clear: both;
}
This is just an css workaround the other way of doing it with js and php is outside of our support scope.
-Rui