{DISCOUNT} section used to list calculation templates used as discounts (configured to decrease ticket amount). The term confuses you but even it named as Discount what you’re listing there is Order Tags. {ORDER TAG TOTAL:X} is a base template (ticket) tag that returns total price of order tags named as x. As you use these order tags as discounts you’re referring them with discount name. That has no relationship with {DISCOUNT} or [DISCOUNT] sections.