Copy Paste from Excel to Word

I build x-y graphs (Economics) in Excel and have a number of them pasted into my Word document.  I have copied graphs from one location to another in my word document a 100 times.  All of a sudden, if I copy/paste a graph from one location to another, go in to edit it, and then click off it, it leaves a ghost image.  I can't get the ghost image to go away without closing out of the document.  Anyone have any ideas?