(This issues impacts purchases made before Feb 9, ’10)

The price shown for related issues doesn’t change. To fix this bug:
1. Open product.liquid (in Admin > Assets > Theme Editor) and scroll down about 2/3rds of the way down.
2. Look for the code that reads: “{{ product.price | money_with_currency }}” and change it to “{{ related.price | money_with_currency }}”