discount values are different in admin order details and customer invoice

Hello,

I have several price rules each giving a fixed discount on the cart value.

In my example it works like this:
Buy 8 items from product list X => get 13,00 EUR discount
Buy 8 items from product list Y => get 13,00 EUR discount

That means the customer can get up to 26,00 EUR discount.

However, in the WooCommerce order details and in the invoice that the customer receives by email, this is displayed and calculated differently.

Here are some screenshots:

Screenshot pricing rule

Screenshot Admin Order Overview

Screenshot customer email / invoice

In my store all prices are displayed including taxes.

In the admin order overview, the discounts are applied before the taxes. This is understandable, although it results in wrong numbers.

In the invoice for the customer (and the order completed email), the discount is displayed as -25.99 EUR. I don’t understand where this number comes from. Why is this -25.99 and not -26.00?

Now the admin order overview is not too important, but I’d need a proper invoice with correct numbers. How can I make it so that at least the invoice shows the correct numbers?

I hope you can help me or tell me what the problem is.
Please let me know if you need further information