shopping cart logic in a big mess

added 15 issues of mosnews to my shopping cart, and got only 3 of them when i checked out. 

hard to describe the pattern. did it again and let you see it.

https://www.loom.com/share/bac30431795849689d1a9c63f8e32aec?sid=3eaec70f-cb50-485d-9ba9-6cfe11e3b727

