Discount not shown in order details summary

Hello,

I want to give my customers a discount of 3% if they pay via bank transfer, shipping costs excluded. This works great so fur, but when I look at the order details in the WordPress backend, the wrong subtotal is shown. On the bottom of the page there is
– the subtotal WITHOUT the discount
– taxes INCLUDING the discount and depending on the subtotal minus the discount
– the total amount INCLUDING taxes and the discount.

So this is really really confusing and I think it is shown on the invoice in exact the same way (haven’t tried it yet). It would be best if the summary would be something like:
Subtotal
Discount
Included Taxes
Total

Is there any chance to solve my issue? I am really helpful for any advance.
Thank you!

Kind regards

Sandra