Duplicates acting as one instance. (!?)

I am working a very complex menu that includes about 120 buttons. 81 of these buttons include an add/remove button within an mc. That MC is inside a bigger mc that also has the name of the feature and the corresponding price within their own mc. So just to recap, it's a ContainerMC with NameMC and AddRemoveMC within it. Why didn't I just say that in the first place?

Anyway, I created these buttons (ContainerMC's) by making a template mc and then manually duplicating them in the library. They are all different and have their own names and instance names. I expected to be able to attach code to each of the NameMC and AddRemoveMC in each ContainerMC to execute script when they are clicked (to increase a running price total, for example). However, all the AddRemoveMc's are acting as one and all the NameMC's are acting as one and adding code to any one adds it to the rest of them. I expected them to act as seperate instances.

If anybody can suggest a way that I don't have to individually go through 81 mc's and duplicate 81 seperate add/remove buttons to achieve this, I would be exceptionally grateful. I would also love an explanation as to why they are not acting seperately as I expected, because obviously I'm not aware of this functionality.

Thanks.