Affiliate sales inc vat ( sales tax) so this less wholesale price is inaccurate commission to be paid

the sale for affiliate should be net of sales tax.

Sale of 24.99 includes sales tax of 4.17 which has to be paid to the government.

If wholesale price is 11.80 then commission due shows 13.17

This should be 24.99 - 4.17 = 20.82

Less 11.80 = 9.02 which is correct