I made a sale with a special coupon code that would give 50% off to specific people, but it was showing the discounted price as available to everyone without the coupon URL being used. I tested it by logging completely out of my account and it still said 50% off.

For now I have disabled the coupon sale by setting it as a "Draft" sale, but this is really frustrating because it's behaving differently to the description "If a coupon code is provided then the coupons's special URL must be used to access the promotion. The sale will not be listed anywhere on itch.io."