Different coupon percentage counting in one order

Hello,

we’re having an issue with the coupon percentage being incorrectly charged.

In one order, the same product is purchased several times.
The applied coupon gives different values for subsequent products.

Example:

The first and the second product in this order:

Product cost 199.20 €
Discount 25.90 €
Total 173.30 €

and next products:

Product cost 199.20 €
Discount 25.89 €
Total 173.31 €

Here is the print screen:
https://en.cs-lab.eu/discount.png

Such calculation of percentages makes accounting in the company more difficult.
I will be grateful for any hint.

kind regards
Tomasz

`
### WordPress Environment ###

WordPress address (URL): https://en.cs-lab.eu
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