Lack of connection between promotion and product

Hello! I am new and glad for this forum! I am creating a product and trying to create discounts.
Register for live certification training - 1 person, 590., 2 people 1180- 50 discount, etc. I am working with the product link, and the promotion link. I am setting the same product name with promotions. Upon initial try, i recognized that the discount was registering too high, double and triple the designated amount. Changed did not register. I deleted everything and re-inputted. Now there is no connection at all between product in the cart and the discount. Suggestions? What am I missing?