Hi @dabeeyow
There should be a two reasons for this !
1) kindly check your catalog/cart price rules - apart from this coupon code is there any other promotional rule is applied on it or not ?
2) second thing check your coupon code settings - have you defined this coupon code discount value as a fixed amount ? or percentage wise discount amount ?
Can you please provide screenshots for the same ? how you have created coupon from backend ? something is missing so !
if issue solved,Click Kudos & Accept as Solution