"Learn Redux" - "Codecademy Store"

I’m working my way through the “Learn Redux” course. I’m stuck on step 15 of the “Codecademy Store” project. Changing the quantity of an item in the cart isn’t updating the total. It doesn’t look like the action is being dispatched for some reason.

Link: https://www.codecademy.com/courses/learn-redux/projects/codecademy-store