Both my father and I are called Carlos. However, I can testify we are indeed 2 different individuals. We share the name, but we are different people. It's just the same with your problem. I get it can be confusing, but they are 2 different things and are not the same. There is nothing wrong with the way your computer accounts for space and files.I'm still confused, but it's mostly 'why does apple do it that way" confusion. In my mind, a document is exactly that, a document, like an RTF, word doc etc. The large 'document' area in that screen shot contains everything EXCEPT documents: Videos, music files and Photos etc.