Can someone explain this economic paradox?

Ok I’ve noticed something recently and it kind of bothers me. Can someone explain the economics behind the following paradox.

I go into Wendys, I see the following on the menu. Spicy Chicken nuggets $.99. Regular chicken nuggets $1.39. Being a spicy chicken nugget implies that you were once a regular chicken nugget, not the other way around. Why does the product that takes more labor\materials to make cost CHEAPER than the more general product.

I used to go into McDonolds. The double hamburger costs more than the double cheeseburger. All cheeseburgers are hamburgers, not the other way around. They would not let me order a double cheeseburger without cheese…