It looks like you're trying to drag a document from within Word to a shared page? You do realize you can't drag an open doc you're typing in as if it were the file, yes? Close the document and drag the FILE to the shared page.
Okay, that makes way more sense. Part of the document is off the screen, and you can't move it. Don't know which version of Word you're using, but I can't duplicate the issue with Office 2011. It's not possible for me to grab any part of a document border and position it like that.