Hi mrsheatherreese,
Your commission is correct, and you aren't doing anything wrong. One of your sales is from the "Offline Affiliate" program, which means someone used your affiliate code as a coupon, so you earned 5% on that sale. So your total commission is less than 20% because of the coupon sale.
You can always see the breakdown of your orders on your
Commissions Report in your Affiliate Account. Please also feel free to email partners@edenfantasys.com with any affiliate questions.