Vouchers: discounts without any sense are applied

[Fred Fournier]

Hello,

 

I would like to ask if you can help me understand a very strange behaviour concerning vouchers. My Prestashop is 1.6.0.9.

 

Let's take for example the last voucher I made.

Highlight: Yes; Partial use: No; Priority: 1.

Valid from-to a range of date I selected; Minimum amount: 0; Restrictions: Compatible with no other cart rules and Cart must contain products from a certain category.

Free shipping: No; Apply discount: Percent (which is 98.33); Apply to: Cheapest product (to avoid multiple purchases of items which are actually semi-free).

 

The result is a pretty confusing scenario. At first I thought that maybe this issue could have been related to my tax system (I set up taxes only for European countries, which are grouped in "Duty & Tax 22%". Under this group there are no other countries besides those within EU. It means that non-EU customers do not see taxes in my store)...

However, I see that many customers from EU are experiencing different behaviours too.

 

E.g.:

- Spanish customer (correct behaviour)

- 60€ product

- Applies voucher which discounts a percentage of 98.33 (-59€)

- Result: 1€

- Shipping cost: 25€

- Total cart: 26€

 

X Spanish customer (wrong behaviour)

X 60€ product

X "apllies" voucher which discounts a percentage of 98.33 (inside order recap from BO the correct discounted amount of 59€ is displayed), but a discount of 64.12€ is applied

X Shipping cost: 25€

X Total cart: 20.88€

 

U.S. customer (wrong behavior)

X 49.18€ product (60€ product without taxes, in this case)

X "apllies" voucher which discounts a percentage of 98.33 (inside order recap from BO the correct discounted amount of 48.36€ is displayed), but a discount of 52.56€ is applied

X Shipping cost: 35€

X Total cart: 31.62€

 

Thing which most impress me is that not only we are having here a negative discount but it even affects shipping cost...

 

With a fake account I also made a purchase using addresses taken from customers which have found anomalies, unfortunately without being able to reproduce this kind of issue.

 

Does someone has any clue?

[Fred Fournier]

More examples from specific orders' pages:

Discount name                  Value

Voucher                 -48,36 € (correct)

 

Products               49,18 €

Discounts             -52,56 € (???)

Shipping               25,00 €

Total      21,62 €

-------------------------

Discount name                   Value

Voucher                 -59,00 € (correct)

 

Products               60,00 €

Discounts            -50,86 € (???)

Shipping               25,00 €

Total      34,14 €

-------------------------

Discount name                   Value

Voucher                 -59,00 € (correct)

 

Products               60,00 €

Discounts            -64,12 € (???)

Shipping               25,00 €

Total      20,88 €

 

From where does Prestashop takes these values?