Recently I have been noticing how people say 'Inventory' in different ways, for example when talking about inventory as in a supermarket stock amount, they say it like this:
I would like a report on our monthly inventory gains
''' In-vn-tree '''
Whereas the same person might say when talking about the inventory of a game character,
Your character picks up the health potion and puts it into their inventory.
''' In-ven-tor-ee '''
Why are the vowels skipped out in certain contexts such as these examples?