The discount isn't applying at checkout — why?

The usual causes, in order:

• Not enough paid items for the first discount step — free gifts don't count.
• An item in the cart isn't in the campaign's eligible products.
• The gift count is outside the step's minimum and maximum.
• A minimum-spend rule isn't met.
• The campaign has ended, isn't published, or the plan has lapsed.

When a rule isn't met, items simply price as regular products — fix the rule or the cart and the bundle price applies.