Admin Coupon not working

Hi there,

I need to create an admin coupon that will not discount any money from the vendor, only from the admin commission.

I have logged into admin, then gone to:

settings>coupons>Commission after consider Admin Coupon? and tried leaving this box blank. However, after a test buy, the commission was taken after the discount.

I then tried checking the box and got the exact same result. Therefore, it seems this section is not working.

The coupon was created from admin account.

This particular test order comes from a vendor with an admin commission of 15%. Therefore, the breakdown with this admin coupon should be as follows:

£10 full price – £1 discount of 10%= £9 paid price.

Admin commission: £10*15% = £1.5 – £1 discount = £.50

Vendor commission: £10*85% = £8.5

Please let me know how to proceed.

Thank you.

The page I need help with: [log in to see the link]